PLEASE somone help me with a 478 cooling installation simple question.

ok i recently got this fan called thermaltake polo 735. I have everything installed just fine but when i try to clip it into the 478 configuration on my motherboard i have a problem. It has two clips one on each side you hook one side into it and then push down on the other side and its supposed to lock.. but i cannot figure out how to LOCKE it please somone help me! its just a standard 478 clip configuration.. it clips in on one end fine but i cant locke it!
 
first of all you really try to find the manual or any *.pdf archive to see if it shows how to clip it in the right way.
 
What kind of motherboard do you have? Some manufacturers such as IBM and DELL use special coolers that dont have the usual locks on them (I learned the hard way. . .)
 
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