It looks like your #3 bit is in its original position, but the blue bit is now pushed in. So, I think you might have to take the black bit (#3) off and 'encourage' the painted part to accept it again upon refitting.
As to 'how'... well, I guess it's a case of undoing the bolts at the points where they're marked on the exploded diagram and wiggling/pulling/praying a little.
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