Scheduling is done from the main window of Hangouts Plugin and users will get to know that fact by a small information window upon clicking the Scheduler button.
After completing the configuration, Hangouts Plugin for Microsoft Outlook will come back to the main window of the app.
Installing Hangouts Plugin for Microsoft Outlook to the 'Plug-ins for Microsoft Outlook' section is a simple procedure.
In case you have issues with installation, the installation notes are available and one can acce