How do you have lucid dreams?

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I've done light research on how to have lucid dreams, but the most easy one I've found was tell yourself each night before you go to sleep that you WILL have one. I've been doing that for a couple weeks now, but sadly, I'm still not having any lucid dreams. I know some people are able to have lucid dreams and some aren't able too, but I had about two short lucid dreams before, so I think I'm capable of having them. But after those 2 dreams, I've never had any other lucid dreams again, and I'd love to have more. Does anyone know any other simple and effective ways on how to have lucid dreams? Thanks.