How to ping yahoo manually

You can ping yahoo manually by visiting the following URL via your browser:

http://ping.feeds.yahoo.com/rss/ping?u=[THE URL OF YOUR FEED]

If your blog URL is: http://[USERNAME].blogspot.com

Then your feed URL is:
http://[USERNAME].blogspot.com/atom.xml

Ex:
http://ping.feeds.yahoo.com/rss/ping?u=http://webeyes.blogspot.com/atom.xml

Other way:
http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=[URL OF SITEMAP]

When your sitemap is changed (ex: a new post), you can ping Yahoo again so that Yahoo can index your site quicly.