At this page, you need to describe your site. You need to read and understand what information required to be filled at all field. I have provided one as example. Refer to the image below.
Your keywords must be relevant with your blog's content, for example if your blog's content is about "Vacation", you can put "hotel", "restaurant" , "resort", "beach" or "travel" as a keyword because this keyword is related to the ads that will be appeared at your blog.
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