Download Apps & Games: Download, install & open. The Google Play Store provides access to the latest music, apps, games, videos, and more to all Google account holders. A Google account must be set up first to complete this process. From the home screen, tap the Play Store icon. Tap the search field, enter the desired search item, and then tap the Search icon. Tap the desired result.
For a free app, tap "INSTALL". If prompted, review permissions, and if you agree, tap "ACCEPT". Apps built for Android 6.0 or later will ask for permissions once you start using them. While the content is downloading, the Download icon will be displayed in the notification bar. To open the app, tap "OPEN".
Uninstall an app. To uninstall an app, from the home screen, tap the Apps icon. Tap and hold the desired app. Drag up to "UNINSTALL", then release. Tap "OK" to uninstall.
Some preinstalled applications cannot be uninstalled from the device, but can be disabled. ♪AT&T jingle♪.
Source : AT&T Customer Care