Place a stepladder beneath the box portion of the garage door opener.
Setting garage door to manually opening.
It should click in place.
This disengages the electric drive from the door and you can manually open and close it.
If the door simply stops short of the floor the likely culprit is the down limit switch.
To manually open most garage doors you simply pull a corded handle that is attached to the door.
Many electronic garage doors come with a bypass switch allowing you to override the system and manually lift it open when needed.
This emergency release cord will be attached to the trolley in the center of the garage door.
To reset it begin by pulling the cord in the opposite direction.
It makes the door operate quiet and makes the chain and all.
To reattach your garage door to opener system you ll pull the emergency release cord down and towards the opener.
To locate the bypass switch look for a red rope hanging down from your garage mechanisms.
Have a helper steady the ladder.
Keep the rollers and chain lubricated on your garage door.
Consult it first before tinkering with your door.