New player Chain Trigger

Im currently level 15 and I have no idea where or how to get chain trigger can someone tell me if i need to be a certain lvl to unlock or its on there im just not looking in the right palce

Class counter -> learn class skills -> Gunner skill tree. As long as you have points and have required amount of skillpoints spent in pre-requisites you can learn it whenever you want.

Be sure to put it on your sub-pallet by the way! It’s an activated skill, so you have to pop it for it to work.

But yes, if you go to the class counter and gunner skill tree it will be there. Be sure to look up some guides before you start messing around with points, as it’s not the easiest thing to do over if you need to shuffle things around afterwards.