Advice? point me to instructions how to reinstall 10.6.X on (2007) iMac, and delete 10.8

Advice.
Can someone point me to instructions how to reinstall 10.6.X on (2007) iMac, and delete 10.8 ? I have disc for 10.6.3.

Here are some guides.
https://discussions.apple.com/docs/DOC-3393
http://support.apple.com/kb/HT3910?viewlocale=en_US

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Advice? point me to instructions how to reinstall 10.6.X on (2007) iMac, and delete 10.8

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