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Using a valid top-level domain name for Google Adsense
You'll need to provide a top-level domain name while signing up for Google Adsense. In the example, forums.example.com, example.com is the top-level domain name.
You'll need to customize your forum's domain name by using a subdomain or purchasing a domain name. Once you've done that, you can provide the top-level part of that domain name in the sign up form for Google Adsense.