Once you are in Update My Profile, do
the following:

(1) Enter your password
(2) Enter your first name
(3) Enter your last name
(4) Enter your email address
(5) Reenter your email address
(6) Enter a phone number 
    (it doesn't have to be a real
     phone number)
(7) Select a security question.
(8) Enter an answer to that question.
(9) Make sure that the box "Do not keep my 
    personal information" is NOT CHECKED,
    else your name will not be attached to
    your clicker number.  This box has
    nothing whatsoever to do with your
    credit card information.
(10) Select Update

You should now see the message (in a yellow box)

            Please Note:
            Your profile has been updated.

(11) Select Back to Account Information.
(12) Select Update My Profile one more time to
     make sure your information has been saved.
(13) Select Back to Account Information.