how to delete device from chegg account?

Both does not work:

Desktop:

Click on the ellipsis ... located on the right side of the page
Click on Device management
Click the Deactivate button associated with the device you'd like to remove
To Deactivate a Device

Go to your eTextbook Library on a web browser by tapping on the House icon in the upper left-hand corner
Tap on the Avatar icon in the upper right-hand corner
Select Devices
Tap the Deactivate button next to the device you want to deactivate