This option is available for all users today in our testing ground, Blogger in Draft, and will be accessible from www.blogger.com in the coming weeks.
If you have a Google+ account and would like to replace your Blogger profile with your Google+ profile, log in to draft.blogger.com and click “Get started” on the promotion message, pictured below.
If you don’t have a Google+ account, you can create one here first, and then head back to draft.blogger.com and look for the promotion message.
People want more integration with Google+. Let Google+ user fetch their new blog post automatic to Google+.