Oh dear. It is possible to get the back seat refitted solo, just not easy. Get it roughly in place then hook on one side at a time and it'll go in.
I suspect you've either missed, or not fully seated, one of the airbag connectors for the back seat, or possibly disturbed one of the seat belt igniters. Unfortunately even if you fix it the light won't go out without resetting the code, which will probably need proper VCDS by the sound of it. Is there anyone nearby with the full version?
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