Summarize this article:

Rest your hands on you rib cage so that you pinky touches your torso and your thumb faces up. Keeping your other fingers clenched, raise your thumb so it points up and parallel to your body. " Generally, you will be putting the tip of your middle finger on the middle joint of your thumb. Your goal is to make the circle with your index finger while your thumb forms the straight line. Your middle finger should be parallel with your thumb. The "L" will appear to come up from behind the "B." " Curl your ring finger so that the tip is level with your middle finger's first joint. One side of the "O" will be your curled ring finger, the other will be your straight middle finger. You do not need your pinky to make the symbol, so tuck it out of the way however it that feels comfortable.

Summary:
Clench your hands into a fist. Point your thumb up towards your head. Curl your index finger against the thumb to make a lowercase "b. Raise your middle finger towards your head to make the "L". Form the first "O" using your ring finger and the line of the "L. Tuck your pinky behind the other fingers.