How do I select a bone in a downloaded Blender skeleton and edit it? I have downloaded a blender skeleton that I would like to make more realistic, e.g. separate the two pelvic bones that he has, into the 6 real bones.  Brand new to Blender, any help is appreciated.
Right click on the armature to select it, and go into edit mode. Right click on the bone you want to divide into smaller bones and press W and choose subdivide. On the left panel (press T to show it if it's hidden) change the number of cuts from 1 to 6.