How to fix a bad kisser?

In my experience, there isn't really such a thing as a good/bad kissing or good/bad in bed. There is only compatibility. He kisses like that because that's what he likes and that's what feels good for him. If you want to change it, you're going to have to talk about it outright. I would usually suggest telling him what you do like rather than what you think he is going wrong, but you can also gently tell him if particular things aren't really doing it for you. If he is willing to listen and change to something to might enjoy more, then that is great! A lot of times though, two people just aren't compatible sexually and there's nothing wrong with ending a relationship if that is the case. Don't feel bad about it. Sex is the only major difference between friends and partners (in my opinion). You can have just about everything else with literally anybody. So if you're monogamous and choosing one person to be with intimately, you better damn well love the way those intimate moments play out. Otherwise keep looking, you'll find someone who fits you better.

Good luck!

It is very difficult if they won't take hints or 'instruction'.

I would just continue to teach him , maybe take the lead in kissing and teach him the right way. And trust me a bad kisser doesn’t mean bad in bed. Two totally different things. I think you might just need to continue taking the lead and see where it goes