Airtap in hololens

On a airtap with the builtin Hololens cursor , how can i navigate from one scene to another scene (using unity3d

I’m not sure I understand your question.
If you’re asking how to change between scenes in your project using buttons and the AirTap function, you can implement IInputClickHandler from the HoloToolkit and add this line to the click event to load a new scene.

    SceneManager.LoadScene("Name_of_your_scene");