Please follow the steps below to perform a reset, this will delete any user data currently stored on the tablet, so please backup all contacts and applications you wish to retain before following these steps.
1. Press the Reset button (located on the back).
2. Hold the back button until the Recovery menu comes up.
3. Scroll to the Factory reset option (using the Home / Menu buttons) and use the Back button to select it.
4. Select the option to Reboot the device.
This will complete the reset procedure.