convertible top education maybe basic, maybe not
 

I recently purchased a 06 A4 Cab. The top didn't work when I bought it and I knew that. I had done some research and it looked like something I could fix. I've cleaned the motor up and reassembled and now Im trying to manually put the time down and back up for the first time. I unlatched the front OK but I can't get the key to unlatch the cover in the back. I don't want to break anything but I'm not able to unlock it. Any suggestions on what might be the problem? any tecnhique recomendation on how to do it would be appreciated. Car didn't come with a manual so I'm somewhat in the dark.
thanks
Duane in dayton ohio