Memberships are for 1 year from the date you join.
Payments are best online. Note you do not need a PayPal account to pay online. You will be directed to a PayPal webpage but you can just pay with a credit card.
Renewal or Upgrade Membership
You will receive a renewal notice a prior to your renewal date with instructions on how to renew. If you do not renew, you will receive two notices after your renewal date at which time your membership is "lapsed".
If you want to upgrade your membership level (i.e. from General to Patron), go to your Profile (click on your name in the upper left). Under Membership Details select "Change" and follow the instructions.