Sorry, don't know what to say on this one.
I also thought you might need to get an email and respond to that to verify yourself. But I guess that whatever it is you need to do to verify yourself, you won't get a chance to if you cannot click the button to agree.
And yes, if you're not seeing the button to hit, then it does seem like a javascript problem. But is it your problem Javascript problem or theirs? I experience MANY Javascript errors at Yuku.
I guess you could try to start over with a different name and see if today you get all the right buttons.
ORRRRR, you could get someone else to register a name for you and then use that account.