After approval you should have been asked to set the card up in the Wallet app. See if the link below is of any help. The physical card has no information printed on it at all, no account number, no expiration date, no CCV code, so it wouldn't be of any help.
Set up and use Apple Card on iPad (U.S. only) - Apple Support
If you are still having an issue then contact Apple Card support directly at 877-255-5923. Know that the Apple Card is managed by Goldman Sachs bank and that's who you will be talking too.
The vast majority of users apply for and setup the Apple Card in their Wallet app without issues. I found it very intuitive when I applied for it.