To make your AGM A8 vibrate, you can use the "Vibrate on touch" setting in the "Sound & vibration" menu of the "Settings" app on your phone. Here's how to do it:
Open the "Settings" app on your phone.
Scroll down and tap "Sound & vibration."
Scroll down and tap "Vibrate on touch."
Turn on the "Vibrate on touch" toggle switch.
Test the vibrate function by tapping the screen or pressing a button on your AGM A8. Your phone should vibrate.
Note: These steps may vary slightly depending on the type of phone and the version of the operating system you are using.
It's important to note that the "Vibrate on touch" setting will cause your phone to vibrate whenever you touch the screen or press a button. If you want to customize the vibrate function, you can also use the "Vibration intensity" slider to adjust the strength of the vibration.