I used the allen key on my sunroof the other day, since I wasn't sure how long it had been since it was opened...

1. Pull the plastic cover off (the black shiny plate one that says something about power roof) using a tiny screwdriver or something else flat...approach from the side, where there is a tiny slot.

2. You've now exposed the hexagonal hole. Insert the allen wrench, and touch the open button, to determine which way to turn the wrench.

3. Slowly crank open (or close) the sunroof. It seems that you are doing it without too much of a reduction gear, so it goes very slow. But it opened mine, which seems it hadn't been opened in years!