How do you use photon blast?

I just started playing psobb Ultima on 7/3/17, and im still trying to get the ropes of the game(and hoping to find a download link for pso2, if anyone knows one msg me) but im still asking this one, how do you use the photon blast with your MAGs? Ive asked people in game chat, and either no one knows, or the dont answer. Im trying to figure out if im just being retarded and looking in the wrong places, but i just want to know how, and thats why im asking. Pls someone help me.

Once you have a full PB gauge (100), hold in the ctrl key. That'll bring up your bottom palatte, where your PBs will be. Note that they override whatever items you already have customized in those slots (if any) until you use a PB. As for the PSO2 question, the game is free to play, so the game itself shouldn't be very hard to find. You should look into the PSO2 Tweaker, though, if you're really interested in playing.

thank you, i actually right now am installing pso2, using the tweaker.