WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.
Open the rear pivot arm nut cover.
Courtesy of FORD MOTOR COMPANY
Remove the rear wiper pivot arm nut and washer.
Courtesy of FORD MOTOR COMPANY
Remove the wiper pivot arm. Use the General Equipment: Two Leg Puller