Unless you've spoken to someone in the club and you know you need to join, you likely do not want to be filling in this form and paying. It does not get you access to Windhill.
To join the Black Canon Collective you need to click to the PayPal button below, that takes you to a PayPal payments page where you pay your £10. Once you have paid you will be emailed a sign-up link. Click on that link in your email and you'll come back to this site where you can fill in your details (name, address, etc). That then creates your account with which you can log into this site to access the forum and perhaps other parts of the site (who knows!).