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Hi Jenny, my name is Jason.
Chances are you have a 4 pronged wiring harness on the boat. 99% of all boat trailers do. Click this link for a picture, this is the style it would have on it. http://www.eyershitch.com/images/4flat-wiring.jpg
Did you have any further questions on the issue?
That's why I was a bit confused. If the trailer is complete then you shouldn't need anything else. The 2 connections between the trailer and the tow vehicle are
1. The electrical connection - This would be the 4 prong plug
2. The hitch receiver, which is part of the trailer and generally not removable.
Without being able to see the trailer myself, all you should need is just the electrical connection and that's it. Does that make sense to you?