To update your payment information, click on Account located in the top navigation, then select Account Settings.
From the left navigation, select Subscriptions & Billing.
Under the Payment and Billing section, click on the Update Card button.
The above screenshot is of Crunchbase Pro (Owner) subscription. Screens may vary depending on your subscription, however, the steps will be the same.
A box will appear with your current stored payment options. Here you can update and enter your new card information. When you're finished, click Update Payment Method.
Note, for Crunchbase Pro users in a team, only the 'owner, admin' can see this information.