MouseLook FPS Sensitivty (DropDown)

Hello! I need help. In my options scene, I want there to be a drop down, that goes from 1-10, (2 of them, one for x, one for y). I'm using the FPS Controller script using the MouseLook script. I have no idea how do do any of this :(. I just want to access:

   public float XSensitivity = 2;
     public float YSensitivity = 2;

(on the mouse look script) with the drop down making the defult 2, and making it so you can change them each from 1 through 10. (also making it save the players choice with player prefs and load it again). Thank you.