How To: Hang a Door

[Malibob]

So I got an aftermarket door and finally got around to installing it today. It doesn't seem to line up. I will take pictures and post them for your ideas but her is what I see...

The door adjustment can go in or out from the body but not up and down. How do I get the door down a little or back. The gap is real tight at the top and the front, and real big at the back and sticking out at the front corner.

Any of you guys have any tricks or have any of you hung an aftermarket door? I am sure there are a TON of ideas on build threads but have no idea where to start looking.

Thanks in advance for your help.