This post features a tutorial on how to add a custom "BIGROCK" domain to Blogspot / Blogger Blogs.
I am assuming that you have already purchased your domain from bigrock.in
Step 1. Login to your account.
Step 2. Click on "Domains" (from navigation - menu) and then click on "List All Orders".
A list showing all your domains will be displayed.
Step 3. Click on the domain.
Step 4. Click on the DNS tab (found on the top navigation - menu) and then on "Manage DNS". We will have to make changes in the DNS settings.
Step 5. (Remember to remove any conflicting records in the A Record List)
Step 6. Adding the CNAME Record
With the WWW prefix
For Host Name type "www"
For Value type in "ghs.google.com" (within the space provided for typing in a fully qualified domain name) and then click on Add Record and you record would be saved.
Step 7. Go to A Record
And add the IP address
Step 8. The final step is link the domain to your blogspot blog. Go to your blogger dashboard and click on settings and then on publishing. Next Click on "switch to custom domain" and then on "advanced settings"
Here enter your domain with www prefix as http://www.yourdomain.com and hit the save button. Click on the publishing tab again and select Redirect yourdomain.com to www.yourdomain.com.
YOU ARE DONE NOW!
NOTE: It would take some time (upto 48 hours but usually lot less than that) for the domain settings to propagate across the internet.