Dr Joe has made free detailed descriptions available, giving the steps of each of the meditations referenced in Becoming Supernatural at the following link:
This will give you all the information that you need as to how to participate in and perform each of the meditations referenced in the book.
Alternatively, if you would prefer the guided version of the meditations referenced in the book, you can find them for purchase at the following links:
Chapter 2: The Generous Present Moment Meditation
Chapter 3: Tuning In to New Potentials Meditation
Chapter 4: Blessing of the Energy Centers Meditation
Chapter 11: Space-Time, Time-Space Meditation
Chapter 13: Project Coherence: Raising the Earth's Electromagnetic Field
Each meditation includes a detailed introduction covering the science and additional information that you will need to participate in the meditation.