1. Generate Your Sitemap.xml File
There are several online XML Sitemap generators however we find this one to be very easy to use: XML Sitemap Generator. Download the sitemap after it has been generated. Upload the 'sitemap.xml' file to your website's root directory (the same location as your 'index' file).
2. Submit Your Sitemap.xml File to Google
3. Submit Your Sitemap.xml File to Bing
4. Submit Your Sitemap.xml File to Yahoo
YAHOO! You're done! No action required because Yahoo and Bing have merged.
With the completion of algorithmic transition to Bing, Yahoo! Search has merged Site Explorer into Bing Webmaster Tools. Webmasters should now be using the Bing Webmaster Tools to ensure that their websites continue to get high quality organic search traffic from Bing and Yahoo!.