If you have restarted it (which is all it usually takes to get out of safe mode) yet are still stuck in safe mode, then try the following.
If you want to get rid of/disable safe mode.
1. First turn off the tablet.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe Mode: Off" or something similar.
4. If you wanted re-enable safe mode, simply repeat the steps above, and you should see "Safe mode: ON" rather than Off.