For Google Music see here.
For other services:
- Hold your finger on the screen to open the Circle Menu.
- Sweep your finger to PREFS
- Tap + icon in upper right corner.
- Select the service you want to access
- Change the view to newly created account (if not changed automatically).
- Enter additional info, such as password or address and port (for i.e. Subsonic).
- Tap circular arrows that are left of + icon to synchronize the service to XenoAmp (if available).