The easiest way to find the GPoS version you are using is to look on the Splash Screen when GPoS loads

This can be done by using a 'Restart GPoS' button, most commonly found on your 'Manager' page.

if you do not have a 'Restart GPoS' button you will have a Shutdown GPoS button. Once GPoS has been shutdown you will need to manually load it again using this icon

 Yours may not have the shield on it but that is not a problem.