If you would like your term and prepaid accounts to automatically convert into open ended (paying monthly, weekly, annually) accounts at the end of their term all you have to do is select the Auto renew option.
Start by pulling up the account that you would like to automatically convert into an open ended account and then click on the Edit button.
From the edit account screen you will see the Auto renew check box. If you check that box, the option to specify a Renewal amount will appear. The Renewal amount is the monthly amount that the converted account will be charged at the end of their term.