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Bolt should slide through 90 and thread into seat.
Once together you can take these in and out within a few minutes, same for bbx boards and even the canopy if you get familiar with it. System seems faffy to begin with as imagine all the bolts are mixed up,but once organised works nice.
If you have a canopy Reccomend spraying it in a dwr with some uv stability, if left outside for a few years it will go grey and crispy if you don't. The windows are generally good, they can fail with a lot of use and kids being kids, easy to repair, take to a tent repair seemstress (seemperson?).
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.