[How do I use the EVA jetpack? PS4]

I'm trying to use the jetpack on kerbin because I'm too lazy to try to get to a zero g scenario right now, how do I use the jetpack? 

EDIT: L2 and R2, but unfortunately, jet packs don't work so well in gravity. 

[New here]

I only knew about KSP as this insanely entertaining Pc game, then it came out on a machine that I regularly play on, and now I'm busy trying to find out how to build a forward swept wing rocket plane with underwing SRBs. So far I'm having barely any luck with just getting it off the ground.