I have a device locked down with a kiosk that allows a few apps. Now I would like to add a new button that executes a script when pressed.

I have added a screen item with type "script://", but when I press it on the device I get an error message saying "Script execution failed". 

Perhaps I am using the item the wrong way. Could someone point me in the right direction as to how to add the script I wish to execute to the home screen item?

Thank you.