1. Click to enter the app store, confirm that it is the account you want to log in, and click the "Settings" option in the charm column.

2. After entering the settings, click "Your Account".

3. After entering, select and click "Add Payment Method".

4. After entering, you can associate the account with the credit card, and you need to fill in personal information to complete the whole process. However, it should be noted that a certain foreign currency transaction fee may be charged after the purchase is completed.