At the top of every page in KnowledgeSuite, there is a button labelled "Instant Meeting"
When you click on this button, it will take you directly into a Meeting Lobby, which looks like this:
To invite other users to an Instant Meeting, you simply click on the Copy Meeting URL button, and send them the link to the meeting via email, text, direct messaging, etc.
If the user you have invited is a Registered User who is not signed in, they will be prompted to sign in before joining the meeting. If the User is a new user they can choose to Register with KnowledgeSuite for a Free account or or sign in as a temporary Guest User.
Instant Meetings are always free.