Check app permissions if an app isn't working. If a feature within an app isn't working as you would expect, check to see if any permissions have been disabled. Disabled app permissions can sometimes cause problems, including users being unable to change avatar or update game.

Please follow the steps below:

1. Enter Settings of your device operating system
2. Enter App Manager (this may look different on different devices)
3. Find the app Army Men Strike
4. Enter Permission Manager