Do this:

1. Enter the guarantee you wish to make
2. Choose the right tax country
3. Enter your email and credit card
4. Click "Guarantee journalism now"
5. The machine will check your card and do some sums…
6. Click "confirm"
7. That's it, finished, welcome aboard. You will get a confirmation email
8. Changes, receipts, invoices: log in and go to "My Account"
9. Problems: matthew@thespainreport.es