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1. Dream images
First type of entry involves looking at the back of your closed eyelids. At first, you will see black and grey fog swirling around. Maybe you see some colors. Then you start seeing simple objects and geometric shapes. These will evolve into more complex pictures and dreams. You may see movie like scenes. When these scenes change into one big movie screen covering your whole field of vision, the dream is ready for you. But so far you are just an outside observer.
You may either wait for it to envelop you and you suddenly find yourself inside of a dream, or you may look at the dream scene, pick a spot on the ground and say slowly and deliberately something like "I am there". This should transport you inside a dream.
This from your link - Gab had also answered me directly.