In the subgroup, choose Chats from the menu at the top of the page. On the right side, click the 3 dots that you see, and choose "Configure Chats". That will take you to a subgroup control panel page, and on the right side of the page you will see "Create Chat". Click that link and it'll walk you through the steps of setting up a chat room.
Those steps assume that you have enabled chats for the subgroup. If you don't see Chats in the menu, go to the Basics page in the subgroup control panel (on the left), and make sure that "Chat Rooms/Events" is yellow in the list of features to be enabled.
If Chats is already enabled, but you still don't see it, check the Navigation Menus in the subgroup control panel to make sure that Chats shows as an active menu item.
Hope that helps--let me know if you have more questions!
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