If you no longer want to use your device to authenticate using PingID, you'll need to unpair it.
First, click on your KochID in the top right hand corner of the screen. Then click My Devices to see the devices you currently have paired with your account along with your primary device highlighted in green.
Next, select the device, or authentication type that you wish to remove. You may be asked to authenticate using your primary (default) device.
Click the icon to the right of the device you want to remove in order to expand the entry, and then click the trash icon. You'll then be prompted to confirm your request.
Click Remove to confirm.
If you only have one device or authentication method paired with your account, next time you log on you will be prompted to register a device in order to access your account.