Any idea how to build a chat app with different personal chat rooms

i want to build a chat app with different personal chat rooms any idea how to do that

Do you have advanced knowledge of App Inventor? Because this is what you will need.

thanks for spending time
You really helpd me
i must to add some blocks to make it perfect but i think i can do it

Guck mal hier: https://www.youtube.com/watch?v=K9Z-xukIxfs