1. After opening the China UnionPay Express application, follow the prompts to register and log in to the account.

2. Go to the homepage of China UnionPay Express Application, click "My" or the corresponding user account option, and then select "Add Bank Card".

3. Enter credit card information, including card number, expiration date, CVN code, etc.

4. When payment is needed, the merchant can choose China UnionPay Express as the payment method and use it directly.