When you first write a new blog/ webpage, it is usually not very popular. Even if you search the blog post & blog name on those search engines, you could not find your page.
In order to let those search engine knowing your site, you have to "register" your site to their database.
Here's the method to add the site to Google & Bing.
Both search engines simply require you to paste your site in the below URL, it is very simple.
Google:
http://www.google.com/addurl/
Bing:
http://www.bing.com/webmaster/SubmitSitePage.aspx
