Here is the information to remove the fender:
If you did all the steps then I don't know as it should come off?
Let me see if another expert has any ideas.......I will send your information to them
Hello and welcome to JustAnswer!
The plastic wheel well liner needs to be removed before the fender can be removed. The liner is attached with plastic rivets (about 10 or so). You'll need to knock the centers out of these rivets and remove the outer part and remove the wheel well liners from the truck. Then you'll be able to remove the fender if everything else is unbolted.
There were six rivets just inside the fender connected to the wheel well and I removed them.