How Do You Attach A Seat-Post On A Bike?

Chrise2

New member
Ok, I just bought a new BMX and dont have any experience with building them, ive put it all together myself and done all the tough complicated bit fine: no probs, its all working and smooth and cool ...but the seat post wont attach to the frame tube. :/
This should be one of the easyest bits, but when I tighten the seat tube clamp it stops the seat going further down, but I can pull the seat post out of the tube easily and can spin it around ...n thats not cool. :/ ...so, whats wrong here?? :/
 
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