Active Membership Contract
You cannot change the billing interval on a membership contract on a customer's account, including its length and end date.
If you need to bill a customer on a set date, you can terminate it and resell it for that date, or use the freeze functionality to set it to bill on that date.
You can change the billing interval in the membership contract configuration for future sales.
Canceled Membership Contract
If a membership has been canceled, you can reduce the remaining intervals.
In the customer's profile, go to Memberships > the ellipsis next to the canceled membership > Cancel renewals.
Enter the number of intervals, confirm the membership end date, and cancel the membership.
If the number is more than the remaining intervals, you will be prompted to enter a smaller number.
