After you might have purchased your domain name here or somewhere else and configured the A and CName records to point to Google, you must add the custom domain to your blog via Blogger publishing settings before the .blosgpot address of your Blogger blog can start redirecting automatically to your new custom domain.
Before you update your Blogger settings with your new custom domain, you must wait for your DNS settings to activate. You know if it has been activated when you see "Google error" displayed whenever you visit your new custom domain. If you attempt to change the Blogger publishing settings before the DNS changes activate, your blog will not be accessible but Blogger will let you know with a warning message.
How To Get Started
==> Login to your Blogger dashboard (New Blogger interface)
==> Go to Settings and click on the Basic tab. Find the area for "Publishing" as seen in the picture below:
==> Click the "Add a custom domain" link and you should see something similar to the picture below:
==> Click on the "Switch to advanced settings" link and you will see something similar to the picture below:
==> Enter in the URL for your custom domain in the text box provided, and click Save.
Your blogspot.com address will soon redirect to your new custom domain -- be patient, as it might take up to 24 hours for the redirect to start working. Atimes, it works immediately or after few minutes.
Some helpful notes:
- If your new domain isn't taking you to your blog, wait another day or two to make sure all the DNS servers have been updated. If it still isn't working, contact your registrar to make sure you entered the DNS settings correctly or let me do it for you as explained here.
- Your original Blogspot address will automatically forward to your new domain. That way, any existing links or bookmarks to your site will still work.