Amy, Where are you in the process? What was the initial SG, what was the final SG, what is the current SG, how much simple syrup have you added and have you added either Potassium Metabisulfite or Potassium Sorbate?
As Steve said, you need to add Potassium Sorbate before adding the juice but be aware that once you do this, the yeast will no longer be able to convert sugar to alcohol and the wine may be too sweet. Do bench testing with a small amount and get the ratio of wine to juice that pleases you. Also, I would recommend "no sugar added 100% juice" to avoid making the wine too sweet. You can always sweeten the wine later, but lessening the sweetness is a real job. I write from experience!
And, of course, welcome to another Ohioan!
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