you must log in to yahoo and then you'll get this link
http://submit.search.yahoo.com/free/request
Enter the full URL, including the
http:// prefix (for example,
http://www.yahoo.com) of the site you would like to submit. Enter only the top-level page in your site, our crawler will explore the rest of your site from there. We will automatically detect and remove dead links on an ongoing basis.
Please expect a delay of several weeks before your URL is crawled.