How do I add google adsense

I am using domain.com for everything and the builder is weebly but I can not figure out how to add google adsense. I do not see any drag and drop box or options for this. also I am not completely understanding google adsense in how to create the ad codes. I have never done this before so please if you are able to help try and make the steps as plain and thorough as you can. I do have a adsense account made already.

Here's how to use Google AdSense to generate a few extra dollars for all that hard work. To use AdSense, you first need to create a Google account, if you don't have one already. Then head to the Google AdSense website. To create an ad, just click on the My Ads tab.

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