I have a new place and no instructions for the Genie garage door
opener. Here's my problem. If the power goes out, I have no entrance
to my garage and can't get my car out. There is a small round lock
right now on the door and it connects to a cable that will pull Red
cord and disable the door from the unit.

However, I can't figure out how this works. I can turn the key about
180 degrees and then it stops rotating. My assumption is that I would
have to turn the key round and round until the cable pulls the cord.
Is that right? If that is the case, is there a special way to turn
the key, pushing it in or pulling it out or something?

TIA