This article explains how you can Edit or Cancel your Client's Active Membership Periods.
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Go to the Clients tab then select your client to pull up the profile. Next go to the 'Services' tab:
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Click the Edit icon of the membership. This will pop up new window that will display your client's membership information. The 'edit' option allows you to modify existing information. And the 'pencil' icon allows you to alter fees per period

Hit the 'bin' icon (example below), then you'll have these options to choose from:

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​Related articles:
​Assigning a Membership to a client
​How to modify the number of credits for assigned Packages/Memberships