How do I get a picture under my post?

The following warnings occurred:

Warning [2] Undefined array key "lockoutexpiry" - Line: 94 - File: global.php PHP 8.4.12 (Linux)

File	Line	Function
/global.php	94	errorHandler->error
/showthread.php	28	require_once

Warning [2] Undefined array key "lockoutexpiry" - Line: 573 - File: global.php PHP 8.4.12 (Linux)

File	Line	Function
/global.php	573	errorHandler->error
/showthread.php	28	require_once

Warning [2] Undefined variable $can_access_moderationqueue - Line: 752 - File: global.php PHP 8.4.12 (Linux)

File	Line	Function
/global.php	752	errorHandler->error
/showthread.php	28	require_once

Warning [2] Undefined array key "avatartype" - Line: 892 - File: global.php PHP 8.4.12 (Linux)

File	Line	Function
/global.php	892	errorHandler->error
/showthread.php	28	require_once

Warning [2] Undefined array key "avatartype" - Line: 892 - File: global.php PHP 8.4.12 (Linux)

File	Line	Function
/global.php	892	errorHandler->error
/showthread.php	28	require_once

Warning [2] Undefined variable $awaitingusers - Line: 34 - File: global.php(959) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/global.php(959) : eval()'d code	34	errorHandler->error
/global.php	959	eval
/showthread.php	28	require_once

Warning [2] Undefined array key "style" - Line: 1024 - File: global.php PHP 8.4.12 (Linux)

File	Line	Function
/global.php	1024	errorHandler->error
/showthread.php	28	require_once

Warning [2] Undefined property: MyLanguage::$lang_select_default - Line: 5327 - File: inc/functions.php PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions.php	5327	errorHandler->error
/global.php	1024	build_theme_select
/showthread.php	28	require_once

Warning [2] Undefined array key 1 - Line: 1474 - File: inc/functions.php PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions.php	1474	errorHandler->error
/inc/functions.php	1439	fetch_forum_permissions
/inc/functions.php	3077	forum_permissions
/showthread.php	661	build_forum_jump

Warning [2] Undefined array key "mybb" - Line: 2121 - File: inc/functions.php PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions.php	2121	errorHandler->error
/inc/functions_indicators.php	41	my_set_array_cookie
/showthread.php	669	mark_thread_read

Warning [2] Undefined variable $postsdone - Line: 906 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	906	errorHandler->error

Warning [2] Undefined array key 19451 - Line: 912 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	912	errorHandler->error

Warning [2] Undefined array key 19458 - Line: 912 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	912	errorHandler->error

Warning [2] Undefined array key 19468 - Line: 912 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	912	errorHandler->error

Warning [2] Undefined array key 19470 - Line: 912 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	912	errorHandler->error

Warning [2] Undefined array key 19605 - Line: 912 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	912	errorHandler->error

Warning [2] Undefined array key 19451 - Line: 1643 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	1643	errorHandler->error
/showthread.php	924	buildtree

Warning [2] Undefined array key "profilefield" - Line: 6 - File: inc/functions_post.php(484) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions_post.php(484) : eval()'d code	6	errorHandler->error
/inc/functions_post.php	484	eval
/showthread.php	925	build_postbit

Warning [2] Undefined array key "canonlyreplyownthreads" - Line: 672 - File: inc/functions_post.php PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions_post.php	672	errorHandler->error
/showthread.php	925	build_postbit

Warning [2] Undefined array key "showimages" - Line: 768 - File: inc/functions_post.php PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions_post.php	768	errorHandler->error
/showthread.php	925	build_postbit

Warning [2] Undefined array key "showvideos" - Line: 773 - File: inc/functions_post.php PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions_post.php	773	errorHandler->error
/showthread.php	925	build_postbit

Warning [2] Undefined array key "showimages" - Line: 811 - File: inc/functions_post.php PHP 8.4.12 (Linux)

File	Line	Function
/inc/functions_post.php	811	errorHandler->error
/showthread.php	925	build_postbit

Warning [2] Undefined array key "invisible" - Line: 1568 - File: showthread.php PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php	1568	errorHandler->error

Warning [2] Undefined variable $threadnotesbox - Line: 33 - File: showthread.php(1600) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php(1600) : eval()'d code	33	errorHandler->error
/showthread.php	1600	eval

Warning [2] Undefined variable $multipage - Line: 36 - File: showthread.php(1600) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php(1600) : eval()'d code	36	errorHandler->error
/showthread.php	1600	eval

Warning [2] Undefined variable $ratethread - Line: 41 - File: showthread.php(1600) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php(1600) : eval()'d code	41	errorHandler->error
/showthread.php	1600	eval

Warning [2] Undefined variable $multipage - Line: 68 - File: showthread.php(1600) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php(1600) : eval()'d code	68	errorHandler->error
/showthread.php	1600	eval

Warning [2] Undefined variable $addremovesubscription - Line: 82 - File: showthread.php(1600) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php(1600) : eval()'d code	82	errorHandler->error
/showthread.php	1600	eval

Warning [2] Undefined variable $thread_deleted - Line: 104 - File: showthread.php(1600) : eval()'d code PHP 8.4.12 (Linux)

File	Line	Function
/showthread.php(1600) : eval()'d code	104	errorHandler->error
/showthread.php	1600	eval