The usage method is as follows:

1. Merchants that support US dollar settlement can directly use credit cards for consumption: When purchasing overseas or some merchants that support US dollar settlement, you can choose to use a credit card for payment. When checking out, choose to settle in US dollars and provide your credit card information to complete the payment.

2. Shopping websites that support the use of US dollars for shopping: International shopping websites support settlement in US dollars. You can use credit cards to make purchases on the website and choose to pay in US dollars.

3. Go to the bank to apply: You can go to the branch of the bank where the credit card belongs and consult the staff about the specific usage methods and operating procedures of the credit card's US dollar limit. Provide professional guidance and assistance.

4. Contact credit card customer service: Call the credit card customer service hotline, and the voice prompts will provide you with information on how to use the credit card's dollar limit and the operating procedures.

5. ATM machine exchange: The bank's ATM machine can provide exchange services. You can insert your credit card into the ATM machine, enter the transaction password as prompted, select the option to exchange US dollars, and follow the instructions to complete the exchange.