If you are an SOA member and your Forum Account is active, you can login here : SOA Forum Login
If you are an SOA member and you do not have a Forum Account, you will need to “register” an account. That will allow you to access the Technical and Social posts on the Forum.
If you are not a member of the SOA, you will only be able to access the “Open” section of the web site which includes “Boats for Sale”.
In both cases, you will need to “register” an account by following the above link. You will receive a “challenge” email asking why you require an account which will need to be answered before we can authorise your account.
The Membership process is detailed here : Membership application