Help with yellow armatures!!!

Hi its me again…
i have a problem with this yoda mesh i have downloaded…his leg armatures are yellow and i cant move them like i can the blue ones…
what do i do ???:no:

The yellow bones are part of an IK setup. I am not getting the Blender wiki to come up, but you can see info on IK setups in the Wikipedia wikibook for blender here:

http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro/Advanced_Tutorials/Advanced_Animation/Guided_tour/Const/ik