I have a question about defense . When you buy armor and it has defense of 1. Do you get to pick where you put the point of defense in

Range or melee or dose it give you a point to both?

The regular body armors and clothing gives you defense against any attacks, including melee and ranged. However, special ones, like the personal shield generator, only apply to a specific type (in this case, ranged.) Other effects and abilities that increase your defence (like taking cover) often only apply to a certain kind (like ranged only, for cover at least.)

As a general rule of thumb, I would say it is safe to assume that, unless specifically stated in the item or ability description, the setback die is added against all attacks that target him that don't have some esoteric extra way of ignoring that effect.