Audible books can be returned through the “Purchase History” section of the mobile or desktop platform. According to Audible, here’s how to make a return on desktop:
You can return titles from your Purchase history page on the Audible site. After confirming your return, 1 credit will be added back to your account.
Note: All credits received from returning a title expire 12 months after they are issued, regardless of the original credit type.
On desktop:
Select your username from the site’s top navigation.
Select Account details.
Select Purchase history.
Next to the title you want to return, select Return this title.
On mobile web:
Select the main menu.
Select your username.
Under Your Account, select Purchase history.
Next to the title you want to return, select Return this title.
After confirming your return, 1 credit will be added back to your account.