Virtual cards: Virtual cards are active the second you create them. In order to view your virtual card number, click the 3 dots above the virtual card you wish to use, select "See Card Number Info" and verify the security code to reveal your card information.
Physical cards: Physical cards need to be activated before use. You can activate your card(s) from your dashboard. In order to activate your physical card from your dashboard, go to Cards > Pending > Activate. Verify the security code, input the card CVV and expiration date, and click activate. Once you've completed this process, your physical card will be available to use.