Step 1) Use your Heelys tool to pop out the sole saver.
Step 2) Set or align the wheel into the "bracket" as well as you can. Make a fist and hit the wheel with the bottom of your fist to fully "seat" the axles into the "bracket" to insert the wheels.
Step 3) Visually inspect the wheels and axles to make sure they are seated straight in the "bracket" so that the wheels spin freely.
Step 4) Stomp down on each wheel to make sure they are locked securely in place.