I don't have an '06, but on my '03, I simply removed the rear screw at the back of the seat, gently lifted up and back toward the rear of the bike. On the front of my seat there is a bracket that slides into another on the frame -just behind the tank.
I'm sure someone witha new bike will chime in shortly
Remove rear seat screw. Lift up on the rear of the seat 1-2", push seat forward about 1" and continue lifting the rear of the seat. Reverse the process to install the new seat.
When I put the pillow top on my 05 I didnt think it fit to short to line up fender hole then had my wife sit on seat and it pushed back just enough to line up perfect.It was about 1/2 -3/4 inch off.Hopethis helps