Hi keithktam, you have to peel off the pattern before you begin folding.
You can stick the pattern onto thin (ex. 0.25mm styrene; 0.4mm max) using repositionable spray glue. Cut out the outline (you won't need the tabs so you can cut those off too). Peel off the pattern then score the foldlines lightly using a needle on a pin vise (don't use a cutter to score the foldlines -- if you do the joint will break when you fold). Have the tamiya thin liquid glue handy and glue joints as you fold.
For thicker styrene it's more difficult to fold -- foldlines break too easily -- so you will have to cut each face separately. You can hold the pieces together with tape to see the shape before you start gluing. You'll have to take into account the thickness of the styrene, too, and modify the pattern accordingly
Made below from Mattias Malmer's LM patterns. I used 0.25mm styrene. Each one was folded from just one flat pattern with no modifications
done on the patterns. It works somehow because the styrene is thin enough.
http://i.imgur.com/w4zQSzL.jpg