Relax your left arm completely from the shoulder and allow it to hang loosely. (photo. 21)
Bring the left hand to the fingerboard and place the fingers on the first string as shown in photos 22 and 23. Your fingers should be on their tips and placed directly behind the frets (not on top of them) .
Note that while the second, third and fourth fingers remain basically vertical to the string, the first finger curves quite severely away from the second. This extra stretch is caused by the greater distance between frets in the lower positions (i.e. closer to the nut).
Be sure that your wrist remains quite straight, as illustrated in photo. 24. Photo. 25 shows bad wrist and thumb position.