Editing playercontroller blueprint

Is there a way to edit the playercontroller’s blueprint?
I’m trying to make a script that lets me switch certain hud elements when I press right click, and if I do it in my FPSCharacter’s blueprint, it says that self (FPSCharacter) isn’t a playercontroller, therefore target must have a connection.
Soo… Is there a workaround to this?
I’m a complete noob in UE4, so sorry if the solution is obvious!