Ok, so you need to lower it...a quick temporary solution is to add some lemon or lime juice to your water or some vinegar to your water. Add a very small amount at a time until you get it where you want it. I used some concentrated lime juice once...5-6 drops in a gallon of distilled water dropped the pH from 7 to 4! I even added another half gallon of distilled water and it only raised it 0.2-0.3....so go slow :)
However, these are just quick fixes and do nothing to buffer the pH of the soil to keep it where you want it. To do that you'll need to add some dolomite lime as LabRat mentioned or possibly get some pH Down from a hydro store (not the kind used in aquariums).
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