Simple Invite Codes in Membership 3.0 RC1?

I recently tried the trial version of Membership 2.0.7 and I was impressed so I paid for the full version and installed 3.0 RC1 on my single-site install of WordPress 3.3.1. In 3.0 RC1, I no longer see the Simple Invite Codes under Edit Options. How can I access this feature in 3.0 RC1? Thanks for any help.