Adding Multiple Payment Options to Membership Plugin

Hi, we successfully set up the payments for each membership level BUT we want to offer a couple billing options:
1. for Premium - 29.99/mo. billed annually or 39.99 month-to-month
2. for VIP - 64.99 / mo. billed annually or 79.99 month-to-month

We set up the month to month payment but how do we add another payment option to each membership level listed above? Please explain in detail as one support person told us what we had to do but did not elaborate on how or where to go to do this.

Thanks!!