How the hell can you teach someone how to dream? :-\ You're unconcscious fgs...
Its not about how to dream, its about conditioning your sub concious to realise you are in a dream. The most common way is reality checking, and the most common reality check is holding your nose and trying to breath, obviously you can't, meaning your awake, so you tell yourself in your head your awake.
Doing enough of these awake and you start doing them in dreams, when you plug your nose in your dream and try to breath, you can (which is very strange). You then realize you are dreaming, then its like way hay lets fly, or whatever.
Thats an example how you can teach yourself, theres a lot more to it (working on dream recall) and many more methods ie MILD, DILD, WILD.
People who haven't lucid dream'd before don't believe it when you tell them you can controll dream that are as real as you sitting there now reading this, yes it really is that real, if you don't believe me read up on the site i linked if you want to learn.