Go to Main Navigation Bar > Meetings > select a Meeting > Conclude 

In Meeting (In-Session) Mode, Administrators will have the option to Conclude the meeting by simply clicking on the Conclude link at the top of the agenda.

Clicking on the Conclude link will prompt the Administrator to confirm the meeting is over. Attendees will be marked "Out" once the meeting has concluded.

This will conclude the meeting and place the meeting in Meeting (Concluded) mode.