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In the EnglishLinQ#217, Steve said, to get the listeners to like you and establish your credibility, "people will often fumble at the microphone or recognize someone or say something nice". Fumble at the microphone means "struggle to say something"? I'm nor sure if it's make sense.
Fumble can mean to struggle to say something or to fumble with your notes or the microphone itself. I guess by appearing to be a little unsure of yourself or to be seen to be having a little trouble getting started can get people to identify with you.