The DM Guide is your friend.

Sounds like you don't have a map. First, have you actually made a map? If so, is it being included in your compiled project? You can include / not-include different files by clicking the little check box next to the file in Dream Maker's file tree. That may not be your problem, but based on all the info you've given us (basically nothing) there's not much more help I can give you.

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Here's a hint, though. Learning to program properly will actually save you time. The Dream Maker's Guide to Making Games takes you through all this step by step in a way that makes sense, and gets you involved in writing code right off the bat. In fact, it goes over what I just said right off the bat. If that isn't your problem, and you already know how to include a file, then you'll be glad to know that it also goes over how to make walls, pits, and enemies.

If you take the time to read the guide, and other documents that are designed to teach you how to do exactly what you want to do, make games, then you'll be able to jump right into getting your game off the ground. If you don't read it, then you'll be wasting time hitting refresh on your browser, waiting for someone to explain to you what is already said in the guide, and often using the same words. So why sit around?

Did you make an icon for the player?
Did you make a map?