How do I stop my little brother from throwing temper tantrums?

[BuildistGuard]

My little brother is 7 years old and he throws temper tantrums a lot, especially when I try to uninstall Roblox and when I tell him to get off the computer. When he throws a temper tantrum, he falls to the ground, usually takes off his pants and underwear and starts crying out loud. He then goes out of control and screams like a girl. How do I stop his addiction? His addiction bothers me, I can't even do my homework on the computer usually because of his stupid Roblox. He is stubborn and likes to stay on his stupid game.