I notice that when I visit a wordpress blog, and I am logged into wordpress, the comment box at the bottom of a post does not offer me a place to leave a URL to my blog. If I log out of wordpress, then this field does show up. That seems odd to me. I’d like to leave an URL with my comment without having to log out.
You have to go to users > personal settings and then in the “website” field toward the bottom of that page, enter the URL of your blog. Then, whenever you are logged in, wordpress will automatically link your username to your blog.
The other way is to log out of wordpress before leaving comments. Then the username, email and website fields will show up when you go to comment.