Unplug the Craftsman door opener power cord from the ceiling outlet to prevent it from operating if the power comes back on while you are away or the door is open. If necessary, place a step ladder under the opener head so you can reach the power cord plug to disconnect it from the outlet.
Pull the emergency release rope straight down with your hand. The small trolley arm that the rope hangs from should be in the vertical position.
Go to the garage door and grab the handle at the center of the bottom section. Lift the door open and operate manually until the power comes back on.