To turn it on the Add-ons go to the 'Admin area' (you must be an Admin) and where it says 'Customize your Glasscubes account' you can select the check box that turns the extra features:
GlassCubes does not support Internet Explorer 6. Upgrade to a newer version or download and use an alternative browser from the links below: FireFox Safari Google Chrome Latest IE
IE6 was released in 2001 - its very old, has many security weaknesses and you are very susceptible to virus, phishing, harmware.