| Using the Yealink VC Cloud Management Service Platform | 25Switching Roles between Moderators and GuestsThe moderator can assign the visitor as the moderator. When a participant is not expected to be amoderator, other moderators can switch the person to a visitor. Organizers cannot be switched to visitors.Procedure1. In the Conference Control page, tap Participant.2. Tap beside the desired participant and select Set as presenter/Set as visitor.Switching between the Free Speak Mode and the Raise Hand ModeIf you are the moderator and you want the participants to speak with your permission, you can switch thespeaking mode to the raise hand mode. In the free speak mode, all participants can speak freely.Procedure1. In the Conference Control page, tap Participant.2. Tap Free Speak and select Raise hand to switch to the raise hand mode.After switching to the raise hand mode, participants can speak only after the moderator allows theirspeaking application.Applying for SpeakingIf you are muted by the conference moderator, you can apply for speaking.ProcedureTap Hands up.Managing the Speaking ApplicationIf you are the moderator in a conference, you can allow or reject the speaking application of the participant.Procedure1. In the Conference Control page, tap Participant.2. On the Conference Members page, tap beside the desired participant.3. Select Allow to speak or Forbid to speak.Blocking/Unblocking the AudioThe moderator can block/unblock the audio of any participant to control whether the participant can hearthe voice in the meeting.Procedure1. In the Conference Control page, tap Participant.2. Tap beside the desired participant, select Block Audio/Unblock Audio.