If you want to modify your password hint questions on eBay, please follow the steps below:

1. Log in to your eBay account.

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

3. Click "Account Settings".

4. On the "Account Settings" page, click "Personal Information".

5. On the "Personal Information" page, find the "Password Hint Question" column.

6. Click "Edit".

7. In the pop-up window, select the password hint question you want to modify and fill in the corresponding answer.

8. Click "Save".

9. Your password hint question has been modified successfully.

Please note that the password hint question is a very important security setting, which can help you reset your password when you forget it. Therefore, please choose a question that is easy to remember but not easy to guess, and make sure your answer is accurate.