how do I create a chat room

@TheMaskedRebel A brief description is in the help-center: gamedev.stackexchange.com/help/privileges/chat-rooms Here is a post from a local meta with a screenshot: How to create a chat room in MSE?

Some things to keep in mind.

Check the site you have chosen as the parent site. (I suppose you want the room to be associated with a specific site.)

If you want to allow only some users to talk in the room, you need to created a gallery chatroom.

I am not sure - is there something else that is important and should be mentioned here?

You can also create a room for you and a specific user - this is somewhat different type of room. You can do this from the user's chat profile. (And in users' chat profile there is also an option to invite a user to a specific room.)