First remove the circles from the balance board. The circles are in the corners.

Unscrew the 4 circles first then unscrew the middle screws that secure the base.

Remove the circles and the base.

If you want to take off the motherboard first you have to unscrew the screw in the middle then you can take it off.

Then when you're done, screw back the motherboard in the same place where it was.

When you're done screwing the motherboard in, screw back the middle piece first so you can put it back together.

The last step is to screw in the corners and the circles, and then you will be done.