Steps to add the link for your latest blog post to the member information within your posts ...
Step #1 - Click on User CP from the navigation menu.
Step #2 - Click on Edit Profile from the left side navigation.
Step #3 - Scroll down near the bottom to External Blog and enter the URL for your blog feed.
If you do not have an XML feed that uses the type of URL shown in the screenshot, then it may be necessary for you to use a service such as
FeedBurner in order to create a standard feed URL (Those of you using free blog services such as Blogger may need to use FeedBurner.)