Connecting Blogger With Google Plus
This trick will work only if you have your Google+ and Blogger profiles under the same Google Account with a common name. If both your profiles are under one account, then you are in luck. Simply log in to your blogger account, and go to your blog dashboard.In the top-right region of your screen, you will see a cog icon.
Clicking on the cog, you will see an option to Connect to Google+. Click on that, and you will see a confirmation screen.
You are ready to make the switch. Just check the "I've read...." box and click switch.
If in the future, you want to disconnect the two accounts and revert to your Blogger profile, you can simply use the cog icon again, and there'll be an option to disconnect the two accounts.
Sharing posts
Once your posts are linked, you will see an option to share your posts right from your Blogger dashboard. This will also let you share your posts whenever you want, without having to deal with auto pop-ups.
Besides this, whenever you publish a post, you will see a pop-up box appear that has sharing options. It is pre-filled for your ease, and you can add a comment as you like. You can also choose which circles you want to share the post with. By default, the option will be set to Public.
If you don't like this sharing box, and if it's annoying you, you can simply disable it by going into Settings >> Posts and Comments.
That's about it. You can take advantage from this feature to easily share your content without having to manually go to your published pages and then using the available sharing widgets. If you want automation, you can use an app such as HootSuite. If you have question regarding this post, feel free to ask :)