On first opening the application in Revit, you may asked to sign into your Account here. Do this first, before the tools will load in Revit.
Please use the same email address that you used to create your account with Guardian Glass. You should also check the setting for ‘Stay signed in’ so that you will not have to repeat this step. When the application launches, you will have an option to also sign out, if you want to close the application. You may want to do this if you are hot-desking or your machine is shared etc. You may also close the application without signing out.