You cannot sign up to Google Adsense with the default address provided by BlogPress (e.g.

Google adsense requires a custom domain name such as a .com, .org. etc..  (about $15 per year)

You can get a domain name here.

And submit the domain mapping request form (no charge for the mapping) and we'll get it set up for you. Then you just put your new domain name into adsense and you'll be good to go. :)

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