My wallet is not connecting to my phone. It’s says “Not your wallet” how do I resolve this?

If the iPhone Leather Wallet is associated with someone else’s Apple ID, they need to remove it before you can add it. See Remove a device from Find My on iPhone.

It would be better if you can please re-post with a screenshot of "Not your Wallet", in order to understand the phenomenon better. Images/pictures speak louder than words. 

Please understand this is a public forum: While attaching a Screenshot, do not provide any personal credentials, such as IP address, Card detail, email id, apple id, IMEI number, Serial Number, Phone number, Order ID, if you are sharing a map ensure your location is not identifiable, etc.

Adding Credit/Debit Cards to Apple Wallet depends on the country that you live in --> Countries and regions that support Apple Pay