Now, that your pad is positioned right and sticks well on the board, it is time to prepare the pad in order to put the screws back in. To do that, start , if you haven't done it already, by turning your foamy upside down and remove the exchangable fin box.
After that, you can turn your board again, so the pad is facing up. Next, you are going to stab a hole into your traction pad right through the thread where you usually put your screws. You need a hole for the two screws in the middle of the back part of your pad. Additionally, you need a hole on the left and right - but only for the screws that are closer to the middle part of your pad. (No hole is needed for the screws closer to the rail since they are not covered with the pad!)
Side Note: You can just use a ballpoint pen, that fits through the hole to do so.
Put a suitable pen under the board and push it gently up until it reaches the pad. Add some more pressure to get through the material. To widen the hole for an easier installation of the screws, put the pen one more time through the thread.