You can remove the shims in a Specialized multi-position stem to customize the angle of the stem. To tell what angle you have set, look at the "window" on the stem that displays two numbers - one positive, one negative. When the stem is upside down, the negative number is the angle of drop. Counter to that, when the stem is pointing up, your angle is the positive number that is shown in the window. Refer to this visual diagram.
If you need the instruction manual please go to the manuals section of our support page and open "Stem - Multi-Position Stem Instruction Guide."
It is a very innovative design that we are proud of here at Specialized!