On the picture you posted the black clip rotates clockwise from the vertical to the horizontal
To allow it to move you need to depress the blue ridges to the right of the black armature. You can see the part that depresses they have ridges on them
I have only taken the whole thing out before and when it is in your hand it just clips in and out without issue. With no visual and no space, that suddenly becomes a massive issue :lol:
Would you like the scrape your hands and try? oke: