You need to use the Materials room for altering the characters transparency settings. Hoever, if you just want to make the head invisible to view, select it, then select the "Properties" tab. (Right next to "Parameters" on the box with all of the dials). Under Properties, unchek the box marked 'Visible'. To change the actual transparency settings, go to the materials room. At the top, select 'Figure One' and 'Skin Head', then look for the Transparency Value dial on the left bar (the 'Root Nodes' area). Adjust that dial to 1.000 by either sliding it to the right, or clicking the numerical display and entering '1'.