This is the procedure you should use if you are going to be talking for a SHORT time. You simply place your curser over the long button that says "Push To Talk" and LEFT CLICK. The button will change color, from GREY to GREEN. Also, it will change titles, from "Push To Broadcast" to "Broadcasting". As long as you keep the button pushed down, you will be broadcasting. It will say GREEN and will say "Broadcasting". Also, there will be a little Mic ICON beside you name on right list panel. When you remove your finger from off the MOUSE, this releases the button, ends the broadcast, and also releases the Mic for the next person.

Below are two graphics that show the procedure.