Friends button missing – BTS WORLD Review

So yo. I live this game and I’m on level 39 rn but I don’t have the option to add friends. Like I’m trying to add my friends but I don’t have the button that comes out from the +. Please help because I’m trying to add my friends but I can’t. And when they try to add me, it says I’m non existent. Help
Review by shhsvsvxbdbdg on BTS WORLD.