Use the Become an Editor link at the top right of the screen, in your chosen category. Choose a small category, less than 30 to 50 sites, one that is not likely to be a spam magnet. Read the Guidelines. Find three sites that should go in the category and write Titles and Descriptions for them. Keep a copy of your application in a text editor in case you need to resubmit. When you submit, be aware that Internet Exploder sometimes has problems, whereas any other browser should probably work just fine. Allow a couple of weeks for someone to review your application.