There used to be a link on the Home page and I don't see it now.
If you go to community.rsa.com, on the login page is a Register for Access link over on the right side.
Additionally, when you go to the RSA Link home page while not logged in you will see a large red "Register Now" button just below the Log In button, as shown in the screenshot below.
The RSA Link Registration Portal can also be accessed at any time by navigating to https://community.rsa.com/register.
Full instructions on registering for an RSA Link account can be found here: How to Register for an RSA Link Account
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