In the upper part of the tool - the 'Yell-O-Meter' -, one sees with which volumes have had the most yells.
In the middle, one sees the volume control.
In the lower part, the Yells of the last 30 seconds are shown.
The standard setting is that only Yells of the Admins are indicated. If you move the regulator,for example, to the step 3, you would get all Yells of the volume 3 or higher. The color of the regulator (green or red) indicates whether you can yell at that level. With /save you can save you settings.
Each Yell can be valued only once, and disappears after that it out of the tool. Based on the feedback of the Yells it is determined to which step (1-4) you can yell in the future. Mostly positive feedback allows you to use higher levels, mostly negative feedback will will not.
As an alternative, you can click the down arrow next to the tool name in the Toolbar. This will give you quick
access to the tool functions without opening a new window.