Hi Sally! Since elections happen in governance, you'll want to open a new governance meeting for the circle and hold an election for a new Secretary. Any circle member (or admins) is able to open a meeting in GlassFrog, but since Secretary is an elected role, GlassFrog expects you to elect someone new.
Please feel free to contact us via the website if you need help with it or better direction! http://glassfrog.com/contact/.