To invite more people to your conference:

1. Click the "Conference" icon in the Conference window or click the "Conference" menu in the Conference window and select "Invite More People."
2. Select friends or groups from the list and click the "Add" button.
3. Include an optional message.
4. Finally, click the "Invite" button to start the conference.

Please Note: Check the "Enable Voice Chat for this conference" option to enable the voice feature.