How to add adsense to a second blog

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I have google adsense on one blog. I know that you don't need to ask for approval to put adsense on your next blogs. You are responsible to make sure that your next blogs where you put adsense don't violate google terms and conditions. I am just not sure how to add the code. Do I go to google adsense site or do I just go to my first site where I have google adsense, copy the code and paste it in my other sites? Thank you for your help.