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click continue to registration
after that you’ll navigate to Sign up (step 2 of 3) page.
Enter the domain registration information for your chosen domain name.
and note that this information will be listed in whois directory.
then click i accept, process to Google checkout.
if you already have credit card added to your Google account, you can easily press agree and continue
Or you have to add your billing information, credit card number and details to your current Google account.
once you are finished press agree and continue.
next review your purchase and press place your order now.
now your custom domain is setup.
you are finish, please note that it may take 2 for 3 days to your blog to transformation to your new domain.
finally here is video helps you to do it in the right way