If you haven't done this before it basically means you follow someone and they follow you back if they're a bitch and never follow you back then just unfollow them. Yeah you know that thing called common sense? please use it you have it for a reason. As for the people who don't have any common sense I'm sorry but there's nothing I can do for you, you're on your own. And as for myself even though I do fit the bitch description I promise that if you're kind enough to give me a follow I will return the favor as soon as possible. But yeah it's pretty simple so no further instruction is needed nor necessary, enjoy your day.