Re engaging the garage door to the electric garage door unit.
Overhead garage door engage and disengage.
It might be necessary to pull the door closed slightly to fully engage the trolley.
Pull the release rope and push the door all the way up until you hear a click.
The opener trolley will engage the carriage once it comes to the full open position.
All you have to do to disengage it is just pull down on it and pull it toward the house and that will keep it keep the spring on the on the trolley up there extended so that it does not hang up on the trolley and then you ll be able to lift your door from the handle that should be located on one of the lower sections and you can pick your door up.
Make sure the carriage unit is nearest to the garage door.
Some garage doors do not have a manual lock once disengaged from the garage door opener.