How do I use a custom domain name for my blog?
Blogger offers two publishing options for your blog: hosting on Blogspot (example.blogspot.com) and hosting on your own custom domain (www.example.com or foo.example.com). You can change your publishing option at anytime, and your content will always remain unaltered regardless of which of these options you choose.
Before you move your blog to a custom domain, you need to have already purchased a custom domain (www.example.com) from another provider, as you can no longer purchase custom domains through Blogger. There are many companies from whom you can buy domain names, usually for very reasonable yearly prices. A Google search for "domain registrar" will turn up numerous options. Here's a quick list:
Where would you like to host your blog?