The easiest way to put on the headset is by first putting it over your eyes, and then grabbing the headstrap and pulling it over your head. There are adjustable straps on the left, right, and top sides of the headset. Loosen or tighten these until you can shake your head and the headset doesn’t move.
To adjust the image’s focus, you can change the distance between the lenses with a small knob on the bottom right of the headset. You can also change the distance between the lenses and your face by pulling out the grey ring that surrounds the “Vive” logo on each side of the headset, and then rotating the ring. Make sure the lenses are not close enough for your glasses or face to touch them.