HOW DO I ADD A DOWNLOAD?

First you need to have an approved Game Page. Once it has been approved (usually a day or two after you put it up, barring any issues with it) you can go to the Manage Games area (hover over your name on the top bar and it'll appear) and click on the name of the game you want to add a download to.
Then click on Download and you'll be presented with the form. Just do as told and viola~

Please note that RMN uploading times is a little... slow. It really depends on how big your file is, though, so be sure to root out any unused music/graphics files in your game folder before uploading, for optimum speed.