How can I set up my Apple Cash account?

See the,"If the (+) button is missing in Wallet" section of this support article:

'If you can't add cards to Wallet to use with Apple Pay'. Click here --> https://support.apple.com/HT205630

yulia263 wrote:

...how do I set up an Apple Cash account with + button?

Here are a few links to get you started:

Set up Apple Pay in Wallet on iPhone

Add your debit, credit, or prepaid cards to Wallet on iPhone, then use Apple Pay to make secure payments in stores, for transit, in apps, and on websites....

https://support.apple.com/guide/iphone/set-up-apple-pay-iph9b7f53382/ios

Add money to Apple Cash - https://support.apple.com/HT207881

"After you set up Apple Cash, you can add money to your balance using the debit or prepaid cards that you already use with Apple Pay in Wallet"

Set up and use Apple Cash on iPhone (U.S. only) - Apple Support

https://support.apple.com/guide/iphone/use-apple-cash-iph385cf0980/ios

See if anything here helps:

https://support.apple.com/en-us/HT207886