I'm trying to help a user in this question , but he's using a complex posed human-body, and rigify. He posted the model here: http://pasteall.org/blend/index.php?id=43931
I would like to check how to solve his problems, but I need to change the model pose, it seems locked, there should be a sort of IK switch for the rig but I can't find where it is. I'm quite a rigging noob, sadly.
He told me hs's using rigify, but even after enabling it, I can't still pose this model... I'm using Blender 2.78, but could try older versions too.