Turn your iPhone off.
Go to www.iCloud.com
Enter your iCloud User Name and Password here.
Click on the FMIP icon at the bottom off the screen.
Your iPhone should show as turned off/offline. Click on the iPhone icon.
You should be able to see the image on the right once you did the above step.
Click on the iPhone top link again and you will see an X next to your phone. Click there to remove from iCloud. You will get the below message to confirm as well.