Ford F-150 2010 Owner's Manual page 117

Driver Controls
To stow the box side step, with your foot, push the box side step under
the truck until fully latched. Do not push on the button while stowing
the box side step.
Note: Do not use the box side steps to lift the vehicle when jacking.
Utilize proper jacking points. Refer to Changing the tires in the
Roadside Emergencies chapter.
BED EXTENDER (IF EQUIPPED)
Your vehicle may be equipped with a cargo management feature in the
truck bed.
Note: This feature is not intended for off-road usage.
To open the bed extender into tailgate mode:
1. Pull the locking pin toward the
center of the vehicle.
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