If you have Blog on Google and also you have your Google+ account activated and any pages on Google+, then you can promote your blogs on Google+ either by your personal account or by the Google+ Page that you have.
How To Provide Link To Desired Google+ Page?
First of all login to your Google account, and then go to your Blogger home page, then click on your blog that you wan to assign the Google+ profile ot page.
Have a look at the screenshot below:
You have a option of "Google+" on the left side of the page, click on that, and then select either your profile or any of the Google+ page that you want to integrate with your Blog.
Google+ page will come into action when either you share any of your blog or make a new post to your blog, then at that time you can share this post with that Google+ page that you have made default as shown in the screenshot above.
For example, I have integrated my Google Page: iGoogleDrive Google+ Page to my blog: iGoogleDrive