look at your 'urb info' page and tap 'jobs'. find the job you want to get promoted with and read how.
**NOTE! charisma can be earned at the Thrift emporium mirror, body at the jail's weight bench, and the rest at the university(after completing "work study" on mission 2.) play the game after gaining the required amount of skill points. do this to another game for the 2nd promotion.