You can reset the choices you made for that Pirate's Powers and Talents purchased with Practice Points (not sure if it takes Crowns or Gold). You can reset the choices you made for a Companion's Epic Powers and Talents (Gold for members). You cannot reset or change the choices made when you first created the Pirate which includes Class of Pirate, Color and Design of Flag, etc. To make a change in Class (or something else) you either need to start a new Pirate or delete your old Pirate (and lose all his stuff - earned in battles or purchased with Crowns) and start a new Pirate with the same name. I'm not sure how you could easily work with two Pirates with the same name but different classes.