wait a few mins and see if you get a confirmation email... mine timed out when i selected the time to continue and i had to type in my apple ID and PW...but i got a confirmation email... 2 to be exact
This. I got two confirmations from the two different times I added. I will cancel one. If you get the "service unavailable" and your time is gone when you go back in, wait for the confirmation email. Mine took about 5 minutes to come.