Is there a global membership?
WWOOF supports “think Global, act Local” and is structured on a national level. While there are many local WWOOF organisations around the world there is no global list or organisation. You support the local organization and join WWOOF in the countries you intend to visit. There is no international WWOOF membership. We are a network of WWOOF nations!
Many countries have their own national organisations, full details here www.wwoofinternational.org
If you want to WWOOF in any of these countries you first contact and subscribe to the WWOOF organisation in that country. When you join one of these countries you will receive the list of hosts in that country.
It is possible to stay with WWOOF hosts in countries that do not, as yet, have their own national WWOOF organisation, see WWOOF in Other Countries