For Android devices:
- Open the Applications tab.
- Tap Settings.
- Tap Applications.
- Tap Manage Applications.
- In the list of running applications, select the application you wish to close.
- Tap Force Stop.
For iOS devices:
- From the Home screen, click the Home button twice.
- Tap and hold on the app.
- When it starts to jiggle, tap the to close it.
- Double-click the Home button and try opening the app again.
If you still encounter problems, email us at email@example.com.