Originally Posted by bostontrevor
And did you? He's right, but basically it means you should go out, take a quick half-block sprint, then walk back and tighten down the lock ring. Others have suggested bracing the front against a wall and pedal against that to torque down the cog.
Sounds like operator error to me, then. When I got it home, I rode around a bit and let it tighten. All I had to tighten the ring was a set of needlenonse pliers, so it probably wasn't as tight as it should have been. I guess I can chalk this one up to experience.