How to create groups and add someone in a group and how to block the recording in iMessage in the iPhone with iOS 14?

Hello Everyone,
I would like to learn how I can create groups in Imessage with my Iphone updated to the last version (Ios 14.1) how can I add someone to a group, and ¡, when I am recording and audio message, how can I block the recording?, I am not abel to do it. Please, if there is some pocast about that particular matter if you can send me the link to download it would be great, or if someone can explain it to me, I will thak a lot. many many thanks in advance. María