How do i take the dash of my megane to get access to the cardreader?

megane 2003 diesel dynamique. There is a little plastic square just inside the card reader to guide the card in the slot. I must have dislodged it when i was putting the card in the slot i managed to get it out with a pair of tweezers i will now have to get the dash off to get access to the inside of the card reader to clip it back in again. It will only go in from the inside how do i get the dash off to get access the car still starts ok but the card sits all squint and has a tendancy to fall our when you are driving. any help would be much appreciated .
REGARDS TO ALL