I confess to being a little confused as to what you want to do, but here's a guess at your problem. I assume in your case that the Artist box on the General Tab of album properties is "grayed" out and has Various Artists as its entry. You want to change this. There is a button with a right pointing arrowhead at the right of the Artists box. Click it. If Various Artists is checked, uncheck it. You should now be able to enter whatever you want.