1. Login to the Run SignUp Account for the Primary Account holder for the club membership.
2. From your Avatar (image in circle in upper right), click on Profile
3. Scroll down to My Club Memberships
4. Click on the Renew Now button

If the Renew Now button is not visible, you are either: 
1) not logged into the primary account
2) your membership has lapsed longer than an acceptable renewal period set by the club (you can join again as a new member). 

Your membership history is visible under the Primary Account holder's My Club Memberships. 

If you renew from a secondary account, the system will create a new membership account.