Hello

Hello from the UK, I'm having problems entering notes

Be sure to use the proper CANADIAN Postal Code format:
LETTER, number, LETTER, then leave a SPACE, then number, LETTER, number

Be careful with the number ZERO’s, and the LETTER ‘O’

Yes you need a Canadian postal code or a USA zip code to enter a note..

Welcome to the site!

As others have pointed to you on this and the other thread, I think you have your postal code problem fixed. Now comes the part where You start to get addicted, you're going to have to make more trips to Canada now and take more money back to Britain with you! Lol