Pull the stakes in the holes of the feet plates out to release the canopy from the ground.
Tilt the canopy on its side, so two of the legs are on the ground, and remove the pins from the top of the two legs where they connect to the frame connectors. Remove the two legs from the connectors.
Tilt the canopy on its opposite side, and remove the remaining legs from the connectors.
Turn the canopy over so that the canvas ceiling is on the ground and you have access to the frame. Notice the reinforcing central beam running along the center of the canopy.
Remove the pins in all frame connectors connected to the beam.
Remove all cross poles from the connectors. Remove the beam from the connectors and set it aside.
Fit a new beam in the canopy. Replace all frame connectors, cross poles and legs.