The amber colored Kapton tape dots must be removed from each of the twelve standoffs before assembling the boards. These are electrically insulating and will prevent the Gizmo from working properly if left in place.

You can use your fingernails or some tweezers or a pin to poke and lift each dot as shown here.

Start by aligning the two boards side by side like in the photo with the black plastic speaker connector and battery connectors pointing in the same direction.

Place the Circuit Playground board on top of the Gizmo being sure that the connectors mentioned in the previous step are still aligned.

Install a few screws loosely, so that all of the holes are still aligned, before tightening them down.

Finish installing the remaining screws. After that, you're done!