>>13774792It takes practice, for the longest time I couldn't have any effect outside my own "body" but I've steadily advanced. Still not up to the level of completely controlling the scene but I'm beyond where I was.
Best tip I could give, think of a very familiar motion/action you would perform with an object in your hand. In a lucid dream, simply perform that motion while "knowing" the object is there. For example you might reach into whatever pocket you always keep your wallet in and what do you know there it is, you manifested the wallet basically by expecting it to be there when you reached for it. For me, the first time I fully manifested an object, it was a cigarette, I simply made the motion of raising it to my mouth and there it was between my fingers. You can use this same technique for more advanced things once you get it down.
Another easier thing is shifting the overall scene. Materializing specific objects or entities is complicated, but to me at least simply deciding that I wanted the entire dream to change was easier. It can be aided by imagining that you're physically moving to a different place, for example you could fly up and away from where you're at in the dream to some other location. Controlling what new scene you move into is another issue. This is a useful skill for getting out of bad dreams or dreams which are going sour.
On that note, a useful skill which can be developed from lucid dreaming but used when non-lucid is the ability to force yourself awake immediately from within the dream. You can basically force the same sensation that causes you to wake up suddenly from a nightmare. Somehow I have gotten better at this over time but I couldn't really tell you how.