Blogger’s integration with Google+ helps you spread the word about your blog and engage with your readers on a more intimate level.
Depending on when you signed up for Blogger, you might have had the option to associate your Google+ profile with your blog during the sign-up flow. When you upgrade your blog to connect with Google+, the authorship information on your blog will reflect your common name as listed on your Google+ profile. You can then choose to associate certain blogs with a Page, or certain blogs with your profile. This association determines to which streams the posts will be shared once they're published.To manage your Google+ settings as they relate to your blog, just click the Google+ tab in Blogger.
Associating your blog with your Google+ profile
If you blog under your common name (eg. “Jane Smith’s blog”), you’ll find that associating your blog with your personal Google+ profile may increase your blog’s discoverability and make it easier to form communities with other bloggers and readers.
When you link your blog to your Google+ profile, you can share posts directly from Blogger to your personal stream.
You can change your blog’s association with your Google+ profile to an association with a Google+ page via the Google+ tab on Blogger.
Associating your blog with your +Page
If your blog is a brand (eg. “The Coffee Bar”), you can link your blog to a Google+ page. By creating a page for your blog you’ll find that linking your blog to your Google+ page may increase its discoverability and make it easier to form communities with other bloggers and readers.
When you link your blog to your Google+ page, you can share posts directly from Blogger to your page. If you associate your blog with a Google+ page, any Blogger gadgets that originally pointed to your Google+ profile will then point to your Google+ page. The same is true if you switch from a page to a profile.
If your blog is currently associated with a page, and you would like to link it to your Google+ profile or another page you own, you can do so via the Google+ tab on Blogger.
Blogging under your Blogger display name
If you don’t want to connect your blog to Google+, you can still continue to blog under your Blogger display name. Remember that you can have a Google+ profile or page even if you choose to have a Blogger display name -- the difference is that the two won’t be linked externally.