Change credit card, view invoices, designate billing contact
You must be the account owner or billing contact to change credit cards of view invoices.
To change credit card information, view (or print) invoices, or designate a billing contact*, go to Subscription and scroll to the bottom of the page.
*Billing contact is assumed to be a non-Roadmap user (e.g. Finance or Accounting) so you cannot designate an existing Roadmap user. The workaround is to use a personal email address. Be sure to be aware of which user you're logged in as!