If you wish to reset Signagelive on your ChromeOS Player, please follow the steps outlined below:
Deactivate your Player from within your Signagelive Network
Uninstall Signagelive using the steps in this article
Re-install Signagelive using the steps in this article
Once Signagelive is reinstalled and an activation code is displayed on-screen, use this to re-activate your Player within Signagelive