There are a few boards on the forum that only members will have access to. These boards include Exclusives that are offered to Feeling Lucky members, as well as contests for Feeling Lucky members.
It is pretty easy to gain access to these MBA boards.
The first step is to register to become a member of Feeling Lucky. You can do this by either clicking on the "Welcome to Feeling Lucky, Sign Up Here" on the main forum page, you can register by clicking on the MBA board you wish to have access to and registering there, or you can register here.
Once you are a registered member, creating one post (usually in the Welcome forum) will give you complete access.
It may seem like a lot, but it's really pretty simple...sign up, make a post in the Welcome forum, and enjoy all boards on Feeling Lucky!