Problem
You need to add a monthly billing option to an existing membership.
Solution
Follow these steps to add a monthly billing option to an existing membership:
Go to the navigation bar and click Settings
> Invoicing > Membership Types.Click Edit for the membership you want to add a monthly billing option to.
Click Basics > Duration & Billing.
Click Add another option.
Add the billing type for the monthly billing frequency. You can bill upfront or monthly.
Enter the price for the newly added monthly option in the Billing step.
Click Save & Next. Continue clicking Save & Next until all changes are saved.