I have also accessed FitDay from numerous computers. You are referring to the online version, right, as opposed to the PC version?
My advice is to post a screenshot of what you get when you try to do it, so that the tech people can see what's going on.
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days