If you need to access the Billing settings of the specific workspace, please follow these steps:

1. Click on your profile icon in the top right and select Manage Teams in the menu.

You can also click the Settings icon of the specific workspace (skip step 2 in this case)

Or you can click on the plan name in the sidebar (skip the 2 in this case):

2. Click on the pencil icon of the desired team.

3. Once the team is open, select the Billing tab.

4.  Then click on SELF-SERVE PORTAL.

5. In the popup you will see the Payment Methods and you will be able to add or remove a card.