I have a 24 In iMac 7,1. I want to update my software to Mountain Lion, but I do not have enough RAM to do so. Can you walk me through steps to upgrade my memory. I am new to this and would like to add at least 6 GB of memory in preparation for new update

I would like to do this, but I just want you to know that I am not an expert so some things I would like you to be clear on.

Please watch this movie for instructions:
http://eshop.macsales.com/installvideos/imac_mid_2007_mem_m/

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