How to add a card in Apple Pay?

Click on this link and read how to set up Apple Pay --> Set up Apple Pay - Apple Support

If you can't add cards to Wallet to use with Apple Pay, read this support article --> If you can't add a card to Apple Wallet to use with Apple Pay - Apple Support

Tap on the (➕) icon at the top right of the screen and follow the onscreen prompts.

If you get the Learn More dialog box that takes you to the support document you posted from, make sure your iPhone is set to a country where Apple Pay is supported in Settings ➜ General ➜ Language & Region ➜ Region. click here ➡️ Countries and regions that support Apple Pay - Apple Support