Medhue streamed a tutorial this weekend. He was showing how to switch between IK and FK animating. In September 2014 I was facing that problem and posted a tutorial titled: Blender-AvaStar Animation IK/FK Tip because I couldn’t find any tutorials saying how to change between the two animating styles.

I think the video is a way better tutorial on switching between the two styles than my old ‘text’ tutorial.