From Yuku Help

Adding a chatroom to your community

To add your chatroom, go to menu > admin menu > look & feel > edit forums & chat

There you just add a chat room in a similar way to adding a forum with the add chat button.

Security settings for your chat

To edit the securit settings for your chatroom, go to admin menu > chat > security*

There you can set the profanity filter, flood time time, ban time after being kicked from a room, and the character limit on each post.

* the chat tab is no available from the menu, instead you need to go to your admin area first, then use the tabs