Mounting the Circuit playground and Battery is easy. We'll use use tape to mount the battery, and the Circuit Playground will be held in by the RC Car's cardboard tabs.
Turn the RC Car upside down and slide the edges of the Circuit Playground Express under two large cardboard tabs. Keep the USB jack pointed toward the car's 'antenna' as seen in the photo above.
Apply a small piece of double-sided tape to the battery and press it into place at the front edge of the car's underside.
Connect the battery to the Circuit Playground and turn the car right side up again. That's it - installation is complete :)