Delete WiFi Passwords - Kindle Privacy | The Ultimate Kindle Tutorial
Any time you log into a WiFi anywhere with your Kindle, the device will not only remember that Wireless Network for the next time around. It will also save the WiFi-Passwords to the Amazon Cloud.
In case you use the Paperwhite at work, your employer might not be too happy about this fact, so you have the option to delete saved passwords
Got to the WiFi & Bluetooth Section in the Device settings. Choose “Delete WiFi Passwords” and delete all passwords.
Unfortunately this setting is “All or nothing” - you can’t pick single networks and delete their passwords. Your delete them all or you keep them all. Makes sense to think about it for a moment before you hit the button.
OR Choose WiFi Networks, and if you are in the Network that you don’t want to use anymore in the future, Choose it from the list and tap forget.