Select the account you want on the home screen → tap the "+" icon next to the main card image on the account screen → name the person the card is for → "Digital".
A supplementary virtual card is good to have for online shopping and monthly subscriptions. If you set a limit on your virtual card that is equal to the cost of your subscription, you will never have to worry that your card may get overcharged.
You can have up to 5 supplementary virtual cards issued for each of your accounts. The details of your virtual card can be easily gleaned from the app: select the virtual card on the home screen → "Bank details".