I don't understand how to open it so that bulb can be replaced. It has no screws. Tried to move white dome anti-clockwise but does move at all.
Looks like ones I have that are springs/clips holding it. Does it turn when you turned it?
If so, you might just have to shift it over a bit, and pull down carefully.
ps. I'm trying to find an example with images of how they fasten online.