As we all know that blogger is a free blogging service provided by king of internet google. It is hosted on google's servers and they cost nothing for it. Even a free domain name containing a extention of blogspot ( .blogspot.com ) is free of charge provided to every blogger. So even if blogger want to remove .blogspot from its blog's URL then he/she can purchase a custome domain from any domain registrar companey and can set it for blogger blog website.
2). then click on settings and select basics (the first option in settings).
3). Now you will see a publishing section containing your old .blogspot.com domain and a link "+set up third-party URL for your blog". Click this link.
- URL Redirect with Host @ to redirect non-www version to www version of your domain, and enter you domain with www in Value field.
- A CName with Host www and enter there the Value "ghs.google.com".
- One more CName record with Host and Value provided by error in blogger domain setting page. It is different for every blog.
And remove/delete all oter records.
9). Now final step is that go back to your blogger accout and hit Save buttin again. it will save setting suddenly. If not, then do not worry and do not alter your namechesp setting. Just reenter your domain in blogger after an hour and see your custome domain is accepted for your blogger and old blogspot.com domain will be redirected to your new one.