The Preferences Tool lets you control some overall settings in MSP. The controls should be more or less self-explanatory, but here is an overview:
The Mute button mutes MSP, but not your computers main sound output. The Volume slider just below lets you adjust MSP sound effect volume.
Show Unit Toolbar and Show Toolbar shows or hides the respective bars, giving you a little more screen real estate if needed.
Click this link to go forward to Step 9, or this link to go back to Step 7.