I still cant enter my billing information.

You may need to clear your cache and cookie data. To do this, you need to click on the 3 dots in the top right-hand corner of your mobile browser next to the address bar. Go to History>Clear Browsing Data. Clear the Cookie and site data and Cached images and files.

*****Important: Close all browser windows and reopen. If you go back to the website without doing this you may experience the same issue.