Does it have the little holes in each side of the head unit face for a removal tool?
If not, you have to first remove the center bezel (two screws) and then unbolt the bracket.
But if it's like my 2002, you need the "Ford Radio Removal tools", or you can take the bezel loose, unhook the other harness connections to it, and pull it out until the radio comes off its slide mount.
The tools are easy to use: just press them in gently until you feel the first click. Then pull them out towards the doors, and pull back.