Overall, I think you're helping your friend, and you are sharing many information already. As for the part where you are saying if you are right or wrong, like I said you did your part already, so I guess there's nothing wrong with that. As long as you shared the information needed, you shared the risks involved in trading, and you already told that he might loss all of his money at the start, then you did the right thing. Like you said, he's very persistent to do trading. Let him trade, and let him decide after getting some experience.
Legally speaking if you do not tell people to buy something, if you just show them how to do something they asked you to, then you will not be responsible for it. If they end up losing money and blame you, that is just blame, at the worst case you will lose a person in your life, but if you are worried about that too much then don't do it at all, if you are not worried about some blame, then know that it is not going to end up with any trouble at all, it should be a decent situation.
I hope that it will do as well as the friend hoped for, but if it goes south then there won't be any issues, at least not legally speaking and it will not be a trouble. I personally helped a few friends, and they did lose money, but they knew what they were getting into so they understood it had nothing to do with me.