The organic search listings on Yahoo! Search is now powered by Bing in the US and Canada. Webmasters should use the Bing Webmaster Center tool for issues related to Yahoo! Search and/or Bing. 

Once you've signed in, you can:

• Improve your site's SEO
• Submit your sites and XML-based Sitemaps to Bing
• Get data on which pages of your site have been indexed
• View backlinks, inbound links, and keyword performance

NOTE: Yahoo! is unable to provide any status updates or assistance regarding organic listings that are powered by Bing.