Want to add a wad?
Type in the full name of the wad, author, iwad, intended port, a description, upload the wad, external download link, select date, add tags, and choose images (or leave the images blank if the wad doesn't warrant it.
The “main image” could be a title screen if the wad has one, or just a nice screenshot.
Tags should be separated by spaces. If the tag has spaces in it, like “single color” it should be “single_color”. The tags can be any information you deem important, gameplay elements, additional authors, awards won, that sort of thing.
Then hit submit.