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At the time of the meeting, you should open the join.me app and enter "titleleaf" in the "join" field.
If you're not logged in, you will need to knock to join the meeting in progress.
Once in the meeting, you should click the phone icon to connect audio.
You can choose to call in by phone or by computer assuming your computer has a microphone.
Note: In case of problems, call the organizer directly on their cell phone (not to be confused with the join.me number).