Ceiling – Remove ceiling lamp holder to change light bulb

ceilinglamp

I have a ceiling lamp (shown in attached picture) mounted in my bathroom. I want to remove the lid and change the light bulb inside and replace the lid. However, I am struggling to remove it.
There are three black holders (clamps). One of them feels like a spring plugged in and has an arrow pointing outward. I tried pulling it out but it doesn’t release the grip on the lid. The other two black clamps don’t budge either. I tried rotating it, applying pressure to the center to life the glass a bit higher but nothing seems to work. Anybody have any ideas? I live in Germany and presumably this was purchased in Ikea but i can’t find the product in their website.
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Best Answer

The arrow on the clip can also indicate that the glass diffuser should be pushed in the direction of the arrow.

That would cause the diffuser to disengage from the other two clips.