As well as clicking 'Join Room' in the Places section of your Address Book you can also enter locations by using either a guest invitation or a specific location 'IVB' file. These automate the process and are useful if you want to bring new people onto iVisit to share with you.
More on creating a Guest Invitaton <More on creating a Location IVB>

When you subscribe to iVisit Plus one of the main benefits is a Home on our server where you can host up to 15 other Lite account users in a multi-party conference, or have up to 8 Guest users. Once in your home these users can all share files, movies and music with the Sharing window and participate in multi-way chat's and discussions.
[further help here]