You are the observer of the mind. You are the witness of the mind. The mind is not you. It is your instrument. It is your tool. It is like when you drive a car. You don’t say the car is me. The car is a tool. You can stop it, you can start it , you can park it, and you can leave it alone. Observe the mind. How to do it: you realize that the mind functions in a certain way. So you have to learn about the mechanics of the mind, how the mind works. Here is an article on 5 Practices to Keep the Mind Elevated.