Check the URL you entered. Site Explorer searches for all the subdomains of your URL exactly as you submitted it. So if you submit http://www.example.com, Site Explorer does not display http://support.example.com because it's not a subdomain. To get the results you are looking for, it's important to understand how to specify URLs in Site Explorer.
Try the following:
If you find that the URL is not in the index, please submit it to Yahoo!.