I finished a mission and went to publish. It says I need to create a map that uses a door for first transition. I though I did that in the beginning but didn't. is there a quick fix or do i need to start from scratch?
When you're in editing mode, there should be some error messages in the bottom left that tell you anything that you still have to do..
Usually when you click on the error, it'll take you to the exact part that you need to do. In your case, it's probably as simple as selecting the box at the very top of the Story mode and select an appropriate "door".