Hi, right this might be a little difficult to explain but here goes, you need to remove the interior light, just pop off the light cover to reveal the bulbs. You should now see the plastic lugs holding it into the roof lining, take out light assembly. Now you should be able to get your hands around the glasses holder under the roof lining. You should be able to feel two lugs bent over to hold it in place on the front edge facing the front, carefully bend them back straight, doesn't need to much force, then either side has similar lugs, do the same. There are two more nearest you on the rear side but if you have bent all the others back you shouldn't need to worry about those. to reassemble just bend the tabs back down to secure against the roof lining. If you want post your mobile number and I will call you and talk you through it.