I am assuming you are meaning "reset", as in "Hard Reset".
If that is what you are seeking to do, you will find the instructions below. However please note, doing a "Hard Reset" will erase anything you placed on the device and restart it with only the original software/os/apps.
Again, NOTE: Doing this will clear the data on your tablet, so it is suggested you not choose this option unless you have to, or aren't worried about losing anything on the device.
Be sure you back up any data you want to keep, to a computer or cloud account, before doing the reset.
To "Hard Reset" the tablet...
1. Make sure that the tablet is actually powered off.
2. Press the "Power" and the "Volume Up" buttons, together, until you see the start-up logo...