Let's do a fast one. At a point in the story you are given a second class to choose. Makes no difference which one is chosen. After you re-live your origin story the new 'powers' app will unlock and the game will prompt you to open it. Just change out one of the powers from your starting class with your new class.
Though I doubt many of you will miss this, I did a video guide to accompany this.
Lets keep on cheevin' together!