Actually, here are the pics. I guess the backrest actually is perpendicular to the stitching on the seat, which is what you wanted, if I recall your thread correctly.
You'll see a bolt at the hinge. Pushing the backrest forward (it's spring loaded-- helps when swinging you leg over the bike to mount it!) you expose the head of that bolt. By screwing this bolt in or out, you adjust the fore-aft position of the backrest (it actually adjusts the fore-aft tilt more than anything else). As you can see, I currently have it mostly screwed in. But if I screwed it all the way in, and then raised the backrest, it would sit a bit further back.
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