Push down and across !!!!!!!!!
Hi, these are really tight and a pain in the arse but the best way to do it is to stick your fingers in the vents up towards the screen then give a quick hard pull downwards, make sure you've got the couple of screws out if they apply on your model and it should pop off, at least enough to get your arm in and get the rest of the clips off. If its not the model with the vents you need to start at one corner with a long flat screwdriver getting as close to the clips as you can then twist the screwdriver as if revving a bike and the clips should pop, don't be scared to give it some grief. Just busy fixing my A4 of the same problem !!!!