As long as your board is hot, you can bend it into any shape by just using your hands (it is really hot, but you can protect your fingers or just wait some first seconds before you start).
After one or two minutes the heat is gone and the glue has hardened again. Your new shape will now rest forever. If you don't like your result you can repeat step 5 and 6 as often as you want to re-shape it.
After finishing the fist side of your board you can go back to step 5 to heat up the other side.