stereo speakers

Hey guys, I am new to this forum so I apologize if I post this in the wrong place, but hopefully someone can help me out. This is my first Explorer and I received it with an aftermarket stereo installed, but the rear speakers were not working. I pulled the stereo out and noticed that the rear...

I cannot find anything online or here on how to take off the door panel properly for a 2004 Mercury Mountaineer? It is different then any video I have seen there seems to be a screw at the door handle that I cannot get to. It seems to curve in and I just don't know for fear of pulling it out...