WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
Slide the plastic sleeve down.
Fig 1: Identifying Transmission Selector Lever
Courtesy of FORD MOTOR CO.
Remove the screws.
Fig 2: Removing Screws
Courtesy of FORD MOTOR CO.
Depress the button and remove the selector lever knob.