If you look at your blogger profile, only the blogs that you started with blogger will be available. Lets see how to "trick" the system to have any other blog.
- Login to blogger and create a dummy blog. Give it your blog name and any address. Eg: "My Thoughts!" "dummy12345"
- Go to the Settings->Publishing of the blog
- Click "Custom Domain" & then "Switch to Advanced Settings"
- Give the URL of your blog there and click Save Settings.
I just linked this blog to my blogger profile. Have a look here.
Remember there is no validation done whether the address you mentioned there is a blog or if its a blog, whether you are a member/owner of that etc. So virtually you can have any URL there (except *.blogspot.com). Check where the "My Employer Blog!" links to :-P