How do I become a member of the hagetisse site (so I can see the vademecum and hidden content)?
You can become a member for free via the Become a member page. Follow the instructions and go through the steps to see the entire vademecum. I hope to see you on the other side of the hedge soon!
Do you want to get an idea of what you can expect from the vademecum? Then read the manual. There are several screenshots in it, so you can see what is still hidden.