I used Paypal for my order and had no such problem. I guess I didn't really pay too much attention though, I use Paypal so much that all I do is click the "Next" arrows at this point :P
I'm not too sure what to do about your problem. I would try signing into Paypal and purchasing after your sign in goes through.What were the options other than "Fitness Anywhere" listed? Was there a box where you could just enter that in?
I'm assuming that you're ordering from FitnessAnywhere.com and not an international distributor, is that accurate?
What do silk, butter, and a baby's bottom have in common? None of them are as smooth as me.