I'm a little confused about abilities. I want to know how to select different abilities for the characters. If I upgrade an ability, it seems to replace one of the two the character has. How do I equip the other ability again? I know this must be pretty obvious, and if it is I completely miss it when I try to do so. The game's info doesn't say a thing about it. (If it isn't obvious, I just barely started this game, got about 10 hours in so far).