Moving Individual Points

While in point mode and with a single point selected, when I press tab to enter the transform tool, there doesn't seem to be anywhere on the gizmo I can click to freely move the point around. I have to click one of the arrows to move it constrained vertically or horizontally. What do I need to do to move individual points freely without the vertical/horizontal constraint?

Also, is there a documentation PDF somewhere? I'm looking for a top-down way to learn the finer points of the software a little more quickly.