How do you use a pistol with bullets in it in Stick RPG which is a computer game

You use that to rob a bank or some store, after you bought the gun and fill in some ammo, go to the bank and there will be a blue button which says 'rob the place', but you need to have 10 karma or enough amount of charm, otherwise you will get caught and put in jail for 5 days.

Hope this works! :-)