Hello Luthur,
Thank you for your question about revoking access. The third-party instructions are there. Try these more specific instructions:
Log in to eBay.
Click the Account tab.
Under Account, Click on Sign in and security under Personal Information.
Click on View next to Third-Party App Access.
On the Sign in and security page, look for Third-party app access.
Revoke access for our application.
Click Apply.
Thank you for taking the time to write in. Please let us know if you need any other assistance.
bidslammer