If you have carefully read over the guidelines for suggesting a site, at
http://www.dmoz.org/help/submit.html you will have all the information you need to request a site be listed.
Of course, you will not be suggesting a site more than once, as that is not acceptable.
Once you have suggested a site, to the one best category, there is nothing more that you need to do.
At some point, an editor will review the site and decide if it is appropriate to list.
mollybdenum