FORD 2013 F-150 v.1 - Manual (Page 163)

Once it is in its forward-most position, tilting it forward once more will
release it to the upright position.
Note: Do not attempt to force the head restraint backward after it is
tilted. Instead, continue tilting it forward until the head restraint releases
to the upright position.
MANUAL SEATS
Moving the Seats Backward and Forward
Recline Adjustment
Manual Lumbar
Turn the control to adjust your
support.
Seats 163
2013 F-150 (f12)
Owners Guide gf, 1st Printing
USA (fus)