As we feel www.YourBlog.blogspot.com is a quite long name, we just like to shortening the URL By setting up custom domain. The process of adding custom domain to blogger is not too harder and we can do this in a-few steps: (if you buy domain with blogger, Steps are not needed )

  1. 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
    Where it says Name, simply enter "www" and list ghs.google.com as the Host Name. 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 (www.example.com). 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
  2. Update your Blogger settings
    Before you move onto this step, wait about an hour for your DNS settings to activate. If you attempt to change the publishing settings before the DNS changes activate, then we'll let you know with a warning message.
    Now it’s time to make sure Blogger knows about your custom domain so that Google can direct readers to your blog. Just head back to Blogger and update the information on your Settings | Basic tab. Find the area for "Publishing," and click the link to add a custom domain.
    Add a custom domain
    Then, click on "Switch to advanced settings."
    Advanced Settings
    Enter in the URL for your custom domain in the text box provided, and click Save. That’s it! 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.
    Enter URL and save
    Congratulations, you’re all set!

(Take more help: Click HERE)
If your domain is not set up in first time, google provides some verification code, That must be added in the cname record of the domain control panel.