So, how do you use adsense?

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Okay, I never use adsense before, and I heard a lot of people talk about it. So, if I want to add adsense to my web page or my blog, what should I need to do? Should I sign up with adsense from google? But how do I add adsense to my blog though? I still a little bit confused on this step. Can anyone guide me through it? Sincerely thanks!