To uninstall Qustodio for Schools from a Windows PC you must uninstall the application from the Windows control panel.
Navigate in Windows to: Settings > Apps >Apps & Features (if you're using an older version of Windows, go to Control Panel > Programs > Uninstall a Program)
Click on Qustodio in the program list, indicate that you wish to uninstall
You will be prompted for your Qustodio username and password, once you successfully enter your information Qustodio will be uninstalled.
Note: If you don't have your Qustodio login or password, visit https://manage.qustodio.com/ and click on the "Forgot your password" link.