Glad you got to drive it! Take the 3 screws that hold the base of the rearview mirror to the top of the car out. Remove the mirror, and look at the back of it. You will see a plate that captures the ball that the mirror swivels on. Tighten the screws holding the plate until it's tight enough to hold it still, but still lets you move it to adjust it. Install mirror back to top of car and you're done!
Take the 3 screws that hold the base of the rearview mirror to the top of the car out. Remove the mirror, and look at the back of it. You will see a plate that captures the ball that the mirror swivels on. Tighten the screws holding the plate until it's tight enough to hold it still, but still lets you move it to adjust it. Install mirror back to top of car and you're done! 
