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That 90 angle piece is on wrong way about. The bolt threads from outside /from the cockpit side into the threaded part of that black alloy 90. Bolt length you might have to play with washers on the outside so that the bolt finish at full torque with no threads sticking out end. When they are new they are a doddle to fit, but once folk have had them on and off a few times and mixed the bolt up it becomes a right head scratch.
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I can't remember by heart, but as @BrickMan said, I think the 90° angle part should be rotated the other way around.
It's bolted on the upper tabs on the back and through the bottom back mounting holes with longer brackets I think.
The canopy adds a whole extra layer of fun to this, so beware.
I strip ours once a year in the spring to get all the sultana's, rice cake, various other bits of crap out crammed everywhere.
And no, you cannot complete this task during afternoon naptime.