The transfer portion of the title should have been completed and signed by the seller and yourself. Then take it to the Tax Collectors Office and they will issue you a title in your name.
When I bought my quad we put the selling price on the title considerable less than the actual buying price. It saved me some cash on the taxes.
Thats not a good thing to put out on the internet for the tax collector (that just so happens to be on his luch break and looking for places to ride this weekend) to see.