On Friday, December 21, 2018 at 2:08:05 PM UTC-5, Tango Eight wrote:
https://www.ssa.org/Join

It's not really all that hard.

T8

"Please use this form for New Memberships only. If you wish to renew a membership please log into the SSA website first."
- and no further instructions.

From the home page, if you manage to find "join" in the drop-down menus, you get this: https://www.ssa.org/HowToJoin - where it says:
"Renew your membership online by clicking here [leads to the page you mentioned]. You must sign up as a new member, but in the instructions box, please advise you are renewing your membership. You can also call the SSA office to renew."

I rest my case.