WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Typical head restraint guide sleeve shown in illustration, others similar.
Depress the locking tabs and remove the head restraint.
Courtesy of FORD MOTOR COMPANY
Remove the headrest restraint guide sleeves. Use the General Equipment: Flat Headed Screw Driver