Within Teamwork Spaces, you can update your billing contact information via your subscription settings

Click your profile image in the top right corner of your site and choose Subscription.

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From the Contact Info sub-section, you can view and update your preferred billing contact information.

Select Change contact info to proceed to your payment details overview. Here, you can change the contact information associated with your subscription.

Click Update to save your contact information changes.

For more information, see: Updating Your Payment Details