Question about selling my boat

I have a question for you all?? New to this and not sure where to post the question. Here it is: I bought a boat from a friend at work. He signed all the titles (boat, trailer) but I never put the titles in my name. Can I resell the boat to someone even though he is the last one to sign the titles and not me? I appreciate any help that I can get.

you signed your done pay the fees and get a new title same with car trailer etc, I sold a trailer to a guy 3 years ago had never reg, it in my name but had old title he demanded I sign title told him if I did he would not be able to register it and he was taking it out of state,after a year he gave up trying to get a title in his state and sold it to some guy in a state without trailer registration.

Not legally, if you are acting as the seller. Open title, class 4 felony. No joke.