[Noob needs help] Could someone explain the process of how to do doors?

[Playguy6]

You want to place a door into the wall... make a door way instead.

I really don't see what you're trying to do.

I was just saying that I make a wall then place a doorway then put the door in the doorway but even if I move the walls to fit the doorway there is still no wall peice above the doorframe. Never mind though I'll do what jens suggested.