[steamship]

Haven't done it, but the attached photo may help. It's the inside view of the cover. It looks like the little lugs clip in next to the base of the metal clip. Can't tell if there's two or four lugs, but looking at the other photo I've attached, I'd try and detach the cover from the back first, though not sure what sort of tool you'd use. Confined space, so plastic trim tools too big and possibly not stiff enough. Best I can think of is something like a dental pick (but stiffer and blunter), pull down gently whilst using thumb on other hand at base of clip to stop the cover flying off/breaking when it does become free.