Stand with your feet about shoulder width apart, pointing your toes outwards slightly
The bar should be resting on your trapezius muscles (between your shoulders and neck) and not on your neck/spine
Slowly lower your bum towards the ground as if you were going to sit on a chair, dont bring the knees forward too much
Now slowly raise your body to the starting position again
Slowly raise the bar above your head without locking your elbows and slowly return the bar to your trapezius muscles again
Repeat steps 3 to 5 until you can no longer maintain correct technique
Tips
Before attempting this exercise, please try both a Squat and Military Press on their own, once you are comfortable with both then you can try this combination out