http://turntable.fm/static/faq.html#47

What does that yellow circle mean?

The yellow button will turn the chat dings on an off.

http://turntable.fm/static/faq.html

How do I DJ?

If you want to DJ in a room there must be an open spot. This will appear as a yellow bubble that says “Play Music” if you click on that you will move to the stage. The DJs on stage each play a song in order from left to right. When it is your turn to spin the first song on your queue will play. You are now a DJ! If there is not an open spot in a room you will have to wait for one to one up.

If you are DJing in a room with a theme is it polite to keep to the theme of the room. If a song on your queue comes up that does not fit with the theme you might want to consider skipping it. You can do this by mousing over your avatar and clicking on “skip my song”. When you are ready to quit DJing you just need to mouse over your avatar and click on “Quit DJing”.

Also, some rooms have organized an informal “DJ queue” that you can ask to have your name put on. Usually the moderator keeps track of who is next in line and enforces the order. This allows everyone to gets a turn to play. If you are unsure if the room you are in has a “DJ queue” it’s good to ask, there are usually some regulars in the room who are happy to fill you in.