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The priorities are as follows
Normal Add a note that will appear on the lead.
High Add a note that will appear on the lead but will always be entered for viewing above 'Normal' priority notes previously entered.
Urgent Add a note that will appear on the lead but will always be entered for viewing above 'High' priority notes previously entered.
Stick To Top Add a note that will appear on the lead but will always stick to the top of the notes regardless of how many notes are entered afterwards and their priority level.
The different priority selected will post your note differentlyin a hierarchy view.
After you have added a note, the next time the lead is queued up to be called, the note notes will appear grouped together by selected priority.