We respond to what we believe or imagine to be true. The subconscious part of your mind will accept the images you give as real. It does not distinguish between reality and fantasy. Everything is in the moment. These new imaginings and suggestions become your new beliefs.
New beliefs become new patterns of behavior.
A new program to access, and you get to choose that program. By using hypnosis, you can take control of your life by giving yourself the kind of thoughts and beliefs you want. The experiences you want will follow. I magery, visualization and suggestion are the most common ways to use your imagination in hypnosis. You can be guided by a hypnotist, or do it on your own.