The things you are trying to do require a lot of learning. The tool you are trying to use (it sounds like Platinum Notes, correct me if I'm wrong) isn't for mastering, but for normalizing the gains of your track library so that you don't have to set your gain structure for each track you mix in during your DJ sets. This is a vastly different mechanical concept from mastering audio, which a lot of audio professionals consider an art form in itself.
Hanging out in the music production board for a while will get you started on your own research into how to do stuff like this. Best of luck and don't get discouraged or defeated if it gets difficult. It's supposed to be.
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