When I got notified to set my pin, the second field automatically showed my email address..
Change that to the pin number so that you enter the same pin number in both fields and then submit.. that worked for me.
In order to confirm your new pin number you need to put it into both of the boxes when you are asked to set it up. In some cases the second box may have been auto-filled with an email address. Please delete this and enter the same pin in here.
If you have not received the notification to set up a PIN please try refreshing the page and logging back into your account.