The best way to share an iGUIDE is shown in the short video below:
A quick rundown of the options under Start Page:
Default: The default viewer setting as set by the Operator
3D Tour: Start with the 3D Tour
Photos: Start on the Photos Tab
VR: Start in VR mode
Use Current 3D View: This allows you to send a specific pano view - this would be the active live pano and angle that you are currently viewing, great for sending links to show features or interesting parts of a tour!
For information on the “Create Virtual Showing” Option, please see the KBA here