How To Block Sign In

Hey guys… i want to block the URL of Epic game launcher when signing in… how do i get the URL to put in Host File… my step brother play fortnite when i am outside and he mess up all the settings… he created his self a new epic game account so that’s why i want to block sign in… so he won’t be able to play the game… or is there any other method to disable the launcher or anything else so tell me please… :rolleyes: