To renew or upgrade your account, log in and go to the My Account page (top menu).
If you had an active membership in December 2017 or later but it has expired, you probably had an account brought from the old site to this site. Please try to log in (top menu) with your username and password. If you do have an existing account, you will have the opportunity to renew on the My Account page. Otherwise, join as a new member.
If there is any question, email the webmaster.