need help getting pocket door bacck on trak

Most overhead doors have a cam locking system to attach the door to the overhead track carriage. You will have to get your hands on a pocket door wrench and manually lower the door down to be able to flip the cam lock switch and release the door from it's carriage. Once you have both carriages free from the door you can get them back onto the track and then reattach the door in the reverse order. If your home is older you may have to remove the doorstop trim from one side of the door to complete this type of repair.

I wish you good luck!