Why This Works
Once you are logged in click on "Your Account" from the top right drop down list.
Generally found on the left column towards the center of the page under "Ordering and shopping preferences".
Sometimes it will show as "Your Profile" and other times it just says "Profile"
If so, you're in the right spot!
If not, please go back the previous steps.
Copy the URL on this page and paste it into the corresponding section on your registration form.