iTunes Plug-in Help
The iTunes plug-in displays the currently playing track of either iTunes or Audion 3. Track information will scroll through the ticker continuously while the music is playing.
Preferences

Preferences
Audion 3 support will be available if Audion is installed on your machine.
You may choose to display Title, Album, Artist, Time and Rating of the currently playing track. Edit the text field to arrange those attributes to your liking. The buttons below the text field insert the corresponding placeholder.
In case you have a recent version of iTunes, the query slider has no effect.
If you are using Audion or an older iTunes version though, the currently playing track is requested from the player via AppleScript. Since these requests can slow down your computer you may want to adjust the time interval between queries.
Contextual Menus
A left click on a song title opens a menu that allows you to change the rating for that song:

Rating Menu
Hold the Control key (or use the right mouse button) to open a menu with basic player controls:

Player Control Menu