I'm new to Blender, and am trying to teach myself how to rig. I have a simple robot model with two arm bones and an IK bone on the hand to control the arm. The IK bone's Deform box is unchecked. I selected the "forearm" bone, then the IK bone, and selected "Inverse Kinematics." Under bone properties, I have specified that there are two bones in the chain. I think that this should make the entire arm should move (bending between the two bones, with the shoulder remaining fixed) but whenever I hold the IK bone, all I can do is rotate it alone. If I grab the upper arm, I can manipulate the entire arm, with the IK bone staying fixed (unless I pull in the other direction--the arm will come with me.) I must be doing something very simple wrong, but I can't figure out what it is.
The leg is an even bigger problem. I have two leg bones and a foot bone, with an IK bone coming off the heel. I select the foot bone first, then the IK bone, and select "inverse kinematics," which makes the two bones rotate a seemingly random amount.