For the wave, you want to raise the hand and arm into the air, tilting the hand outward a bit. By selecting each arm bone and applying rotations, you could achieve such a pose, but it would be difficult and rather unintuitive. If you like, try to use RMB selection and R-key rotation on the arm and hand bones to get something like this pose: Very difficult, no? One thing you may have noticed when rotating the bones was that as soon as you moved them, they turned a bright blue. The blue color is a