Dr Joe has made free detailed descriptions available, giving the steps of each of the meditations referenced in Becoming Supernatural at the following link:
http://www.becomingsupernatural.com/meditation-information/
This will give you all the information that you need as to how to participate 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 link:
https://unlimited-by-dr-joe-dispenza.myshopify.com/collections/meditations
Each meditation is available via download or CD and includes a detailed introduction covering the science, along with additional information that you will need to participate in the meditation.