|Enter Blogger Dashboard > Settings|
|Under Publishing section:
Enter your custom domain in the first box complete with the www prefix.
Save those settings.
You’re done with the Blogger side.
|Log in to your domain registry account (Name.com, GoDaddy, etc.)|
|First, especially if you ported your domain from another registrar like me,
make sure that your domain is set to use your new registrar’s Nameservers.
|Now access your raw DNS record settings (aka “Total DNS”).|
|Enter IP Address 188.8.131.52 as ARecord (@), this is a primary Google endpoint.|
|and ghs.google.com as CNAME (for www)|
|Save Domain registry settings.|
|Fire your page.|