Just push on it while lipping the rubber over bit by bit but dont push to hard. To put it back in put the rubber round the glass put a length of cord or string (not to thin) around the lip that gos over the body but have some lopes in the cord one lver side and one at the top i do then lift the screen into the apetchure and pull on the lopes so the rubber lips over the apetchure do this bit by bit best to get both sides started then the bottom corners then do a bit of the top on both sides then id do the rest of the bottom then finish by pulling in the rest of the top. As u go along aswell lightly bang down on the glass to push it home. Go easy along the top as it can make a real mess of the head lineing!