How can i use the heat sink paste in the cpu

Apply the past somewhat conservatively, but don't under apply. Then simply ensure that you spread the paste evenly on the cpu. For something more thorough, do a quick search of the forum here.

couple of vid links for you man  
http://www.youtube.com/watch?v=o7rPqCvCt0g

http://www.youtube.com/watch?v=prcd2wqIgVQ&feature=rela...

http://www.youtube.com/watch?v=b6NbPMQgwPM&feature=rela...

Hope these can help,
Moto

Hi newcomer and welcome to the Tom's hardware forum.

See answer here

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