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If you can pull the cover back and pull the foam back slightly, There is a bolt that holds the armrest on the seat.
Here is a picture:
The answer above was prompt and friendly - it just applied to a different type of product.
Nice diagram, but I still can't figure out how to disassemble my armrest to repair it. The diagram is for a different type of seat/armrest.
RESOLVED. I figured it out myself. You push the armrest in very firmly which disengages a keyed shaft head. Rotate 90 degrees and the armrest comes right off.
How do I get my nine bucks back?