In GStudio 160 2.53, how do you create the diagnostic report?

I click on the DIAGNOSTICS icon, and it says \"to run the diagnostics test, click the \"TEST\" button below now.\"

OK - so WHAT test button? I can\'t find any test button! I\'ve searched, I\'ve hovered the mouse over everything to see if any of the little pictures are a test button, but nought!

Thanks for any help.