New members can choose the proper membership level, fill in your member information, and pay online using your own credit card or Paypal account, if you have one. Be sure to look at your membership benefits under the "Membership" tab. AAS memberships run from 9/1 to 8/31 year to year, so many new memberships will be prorated.
Renewing members should also use this for annual membership renewal. Just click on "View profile" (upper right corner of this page), then you can renew your membership.