A permalink (or permanent link) is a URL that points to a specific blog entry after it has passed from the front page to the archives.Blogger generates this permanent link based on your post title(If the title is in English). For example if your post title is “Hello World”, the blog post’s permalink would be something like : http://yourblog.blogspot.com/2012/06/hello-world.html Till date Blogger never allowed the user to control what the permalink should be but it rather assigned a permalink on it’s own.
This has now changed and Blogger now allows YOU to decide what the permalink of your new post should be.
This feature is currently available in Blogger’s Draft Version. So if you would like to check it out, head straight over to http://draft.blogger.com and create a new post. In the post options you will see a permalink option.
read the full Post : Custom Permalinks for Blogger Posts