How do you remove the rear turn signal lens on a 2004 F150 pickup

In side the bed of the truck behind the tail light is a cover that you remove to gain access to the tail light , you problly cant see it for your bed liner , pull back the bed liner so you can get to it

Thanks for the suggestion. I wish it was that easy. The newer trucks do not have this access point. When you lower the tailgate there are two screws holding one side of the tail lens unit but I cannot figure out where the others are if there are. The unit is still secure when you remove these two.

The other two screws are up in the finder well behind inner finder.

You have found the 2 inside the tailgate and the outside of the light has two round pionts that snap into a plastic socket in the bedside behind the light. Be careful not to break the light. Try to look into the gap to pry where it snaps together.