Missing Link License: Join the community
If you are a member of a Missing Link dojo, your license for the community will have been handled for you. Your teacher will sort out your Student Circle Membership (or a higher membership, depending on which level you are). You can request your username and password for the License Area on this site from him.
If you are an independent Karateka or martial artist wanting to join the community, you can apply here. It's a very simple process, and a license entitles you to access to the Online Resources, but more important you can attend Missing Link gradings and receive discounts on seminars and workshops.