Swipe down from the top of the screen and tap the gear icon that appears in the upper right corner.

Note: Completing the steps of this method will remove all data from your device and restore it to its original factory state.
It is best to try this method if you are continuing to experience crashing or freezing after restarting your device, or if you want to return to a clean state.
 This is located at the bottom of the screen and will take you to the device’s account and security options., This is at the bottom of the list under the “Security” header., You will be prompted to confirm the actions, after which the device take a few moments to erase and data and automatically reset.

If you want to keep your data after wiping the device, tap “Backup My Data” first. You will need to have a Google account set up to create the backup and restore from it.
Open the Settings.
Tap the “Personal” tab.
Tap “Backup and Reset”.
Tap “Factory Data Reset”.
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