If your blog is not yet eligible to use in an application for AdSense, you’ll see “How to qualify for AdSense” on your Earnings tab. Click that for more information. That links to information in the AdSense Help Center explaining the eligibility requirements. Read all that information very carefully. Because you will be applying for a Hosted AdSense account you should not use the “Sign up for AdSense” button on this page, unless your blog already has a custom domain. When your Blogger blog is eligible to be linked to an AdSense account you will see an orange “Sign up for AdSense button on your blog’s Earnings tab. Before linking AdSense to your blog, do be sure to carefully review all of the AdSense program policies. To link AdSense to your Blogger blog click the orange “Sign up for AdSense button”. That will open the “Welcome to AdSense” page where you have two options:click “Yes” to use the Google account that you’re already signed in to, or click “Create or use another account” to use a different Google account.