Add Your Web url (main address)
Add your email address
Then under Advertiser's Information, Google Adsense's box will already be ticked (checked) if it is not ticked, make sure to tick it.
Go to your Blogger dashboard and click on "Pages"
Click "Create New Page"
On the "Page Settings" set comments to "Don't Allow"
Then Click "Publish"
Then go to your blog "layout" insert a "HTML Widget" on it and link it to the address you copied above.