To change the email address where you receive billing notifications, you need to be a workspace admin—also known as a Doc Maker (Admin):
Click on Workspace settings, which you can find by going to coda.io/docs and clicking on your workspace name on the left panel.
Select the Billing tab.
Edit the billing email address from there:
For any other billing address updates to your invoice, please reach out to support@coda.io.
Related articles:
Overview of Workspaces
Workspace Members and Roles
Who is an admin and where can I view admin controls for my workspace?