Find the control panel on your domain registrar’s website, and locate your DNS (Domain Name System) settings. In order to link your blog to your custom domain, follow the instructions below to enter your "CNAME" and "A-records."
CNAME
Add two CNAME records. For the first CNAME, where it says Name, Label or Host enter "www" and where it says Destination, Target or Points To enter "ghs.google.com" . For the second CNAME, enter "SEEVYMARBN5Q" as the Name and
"gv-OW6THCFPIDA76AKJSYAFQBCY67X2J7NZQYX6DATJQ3LDEXSF3D ZQ.domainverify.googlehosted.com." as the Destination. See our detailed instructions on providing CNAMEs for various registrars. If yours isn't listed, or if you run into other difficulties, contact your registrar directly and they can help you out.
A-records (optional)
The following action links your naked domain (example.com) to your actual site (IANA — Example domains). If you skip this step, visitors who leave off the "www" will see an error page.
Enter your domain name in the format example.com, and list the I.P. addresses shown below in the "A" section. You'll need to create four separate A-records which point to four different Google IPs.
216.239.32.21
216.239.34.21
216.239.36.21
216.239.38.21