Fitday links changed and our profile info here has not been updated to reflect it, so unfortunately a Fitday link on your profile won't take it to the right place.
The blog/journal field in the profile is only valid with 3FC blogs since it is also hard-coded. Unfortunately, we no longer offer new blogs.
After you have been a member for at least 20 days, you'll have a signature option available to you in your UserCP. You can include a link to your fitday account or a blog you set up elsewhere, such as blogger.com or wordpress.com if you wish. A lot of our members have blogs at those sites and elsewhere, and it seems to help them stay on track