If you want to change your username on iOS or Android, you can do so with the following steps:
*****Username can only be changed ONCE****
1. On the main SongPop 2 screen, tap on the little Gear/Face Icon in the top right corner.
3. Tap on "Account Info"
4. You can now tap in the "Username" field and change your username.
5. Tap Save.
Done! You should now see your new username!