To join others or guide people around in your Arkio scene you can use the multi-user menu and click on the icon behind that person's name. You will be instantly teleported to the other user in the same scale and see what they are currently looking at. This works for both VR users that joined the meeting or desktop/mobile users.
You can also gather all the people in your session around you by clicking on the gather icon behind your own name in the multi-user panel. This works for both the VR users and screen users of Arkio and allows you to guide users around or help people new to Arkio to gather