How do I register an inflatable boat in KY that I purchased on Ebay and now want to motorize?

I purchased a small, inflatable row boat on Ebay. In KY, this does not need to be registered, since it is not a motor vehicle. However, now I want to put an electric trolling motor on it and it needs to be registered for that (Sheesh!). I bought it "new in the box." It has never been registered or titled. The only paperwork I have for it is an email receipt from Ebay and a blank Manufacturer's Statement of Origin (MSO) that came in the boat's packaging (signed by the manufacturer). The MSO has sections for the "dealer" to fill out and notarize. What "dealer?" I bought it on an Ebay auction (from some Ebay "store" in KS, I think). Am I expected to try and get paperwork signed and notarized by someone in KS? This was a blow-up boat in a box! There were no "boat dealerships" or titles or registrations involved. It was not sold as a "motor vehicle." I'm turning it into a "motor vehicle." What do I do now?