Ok, I'm going through the tutorial on rigging a foot, and I'm trying to add a constraint to a spacific bone, and all it will alow me to do is add a constraint to the whole armature, is there something I'm doing wrong? How do I select just one bone?

such questions belong on elysiun.com

here a fast answer: switch with the armature selected to pose mode (CTRL+TAB). all bones will turn blue, and the selected ones are a brighter blue. have fun