To bind a new payment method to your eBay account, you need to follow the steps below:

1. Log in to your eBay account.

2. Click "My eBay" in the upper right corner of the page.

3. On the "My eBay" page, hover your mouse over the "Account" option.

4. In the drop-down menu that pops up, select "My Account Settings."

5. On the "Account Settings" page, click the "Bank Account" or "Payment Method" option.

6. On the "Bank Account" or "Payment Method" page, select "Add Payment Method" or "Bind New Payment Method."

7. According to the prompts, provide relevant information about your new payment method, such as credit card number, expiration date and security code.

8. Click "Save" or "Confirm" to complete the binding of the new payment method.

Please note that the specific steps may change due to updates to the eBay website, and the above steps are for reference only. If you encounter any problems during the operation, it is recommended that you check the Help Center of the eBay website or contact eBay customer service for further assistance.