Yeah, load the pic in a paint program (I use Photoshop) and add the text there. Or, go old-school and print it and write on it with pencil (in case you change your mind about a setting).
As far as the "trim wheels" on the base...they are for adjusting the joystick itself. Set them at the center detent and DO NOT EVER change them again. Calibrate in Windows and in AH with them centered and you should be golden.