Ford 2010 F-350 Owner's Manual page 146

Driver Controls
2. Open the latches to release the
panels.
3. Rotate the panels toward the
tailgate.
Repeat Steps 1–3 for the other side of the bed extender.
4. Connect the two panels, then rotate both knobs a quarter-turn
clockwise to secure the panels.
146
2010 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)