If you have a membership that is shorter than annual, you can upgrade it to an annual membership by paying the additional amount necessary. To be eligible for this upgrade option, you must upgrade before your other membership expires. For example, if you bought a monthly membership for $20 on July 1 that expires on July 30, you can log in to your personal web page anytime in July and upgrade to an annual membership that will expire on June 30 of the following year. If the cost of an annual membership is $50, you will have to pay only $30 ($50 minus $20) for the upgrade.
Annual members also have the option of automatically renewing their annual memberships by selecting Auto-Renewal in the Account Preferences section of their personal web page.