When a membership is first added to an organization, you will assign a billing contact. If it is necessary to change the billing contact:

1. On the Organization's Overview tab, scroll to the Memberships section. 

2. Click the hyper-link for the membership you wish to change.

3. Select the desired Billing Contact from the drop-down list. The Contact's email addresses cannot be selected but is derived from the selected contact's default/primary email address.
4. Click Done.