How can I see the name of the participants on every message?

You can know the identity of every participant posting a message on your Wiz. 

To do so :

1 - Go to Configure your wiz > Settings > Participation mode

2 - Select Identified only

3 - Don't forget to Save

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Once activated, your participants will have to be connected with a Wisembly account to be able to interact on your Wiz, and all contributions will be signed. 

Note : the anonymity of your participants usually is one of the main reasons people say whatever they think without restraining themselves.