Replace and tighten the 22 mm lug nut with a ratcheting socket wrench.

Use a hammer and pair of vise grips to slide the wheel retaining pin back into place.

Follow the directions in step 2 in reverse order to reattach the brake cable.

Adjust the brake cable adjustment nut as necessary. The rear brake lever should be about 0.8" to 1.0" away from the handlebar when fully engaged.