To submit your blog to search engines you do any of the following
Google
Google's URL submit is very quick and easy.  Just go to Google's web page for URL submitting, type in your URL, type in the message that ensures Google you are an individual not a software robot and click "add URL."
You can also submit your site map to Google via their Webmaster Tools.
Yahoo!
Since 2010, Yahoo search has been powered by Microsoft's Bing search engine. When you submit your site to Bing you will also show up in Yahoo's search results. See below on how to submit your site to Bing.
At Smart Solutions, we add all of our clients' sitemaps to the auto-discovery directive, robots.txt.  This ensures that all of the search engines automatically know about your sitemap.  It does not hurt to manually submit your sitemaps, for the search engines that allow it. 
Yahoo! Directory also has a paid submission process.  The cost is $299 annually for each directory listing that you submit.   We recommend submitting your site to the Yahoo! Directory if you are a commercial site.  Yahoo! guarantees that your submission will be reviewed within seven business days.  If your listing is accepted, the annual fee will reoccur in subsequent years.
Bing
Bing allows you to submit your URL, just like Google and Yahoo!.  Go to Bing's site submission page, type in the URL of your homepage (this is different than Google and Yahoo!).  MSNBot will follow the links from your homepage to all of the pages on your site.  Bing also requires you to identify yourself as a person, not an automated program, by typing the characters that you see in the picture.
http://search.msn.co.za/docs/submit.aspx
Ask
Ask presently does not allow you to submit URLs.  However, they do allow you to submit your sitemap.  Their interface for this isn't as straight forward as the other engines but, you can submit your sitemap by pasting this URL into your browser bar and inserting your actual domain name...
http://submissions.ask.com/ping?sitemap=http://<your domain name>/sitemapxml.aspx