If you are having problems have you tried clearing cookies/browsing data, opened a different browser, or an incognito tab/window ?
When you bring up the page, scroll down and fill in the form details as requested. Make sure you don't enter your street name/road in the field where it asks for house name/number ( mine autofills and I have to edit it) -
also make sure you put it a tick in the red radio dial box to confirm you are the account holder or the form won't send.
The Service you do for others is the rent you pay for your room here on Earth - Muhammad Ali