1. From the home screen, select the 
AT&T Messages app.
2. Select the
Menu icon, then select Settings.
AT&T Messages app.2. Select the
Menu icon, then select Settings. Messaging Settings
Samsung Galaxy Tab A7 Lite (SM-T227U)
Messaging Settings
Manage AT&T messaging settings.
INSTRUCTIONS & INFO
In order to access message settings, you must have already set up AT&T Messages.