There have similar rule to add Google+ button to your blog or website . So lets go to see .
1. Click this link Google+
2. Make a shape by checking Size, Annotation, Width and Language box.
3. Now click "Advanced Options" then unchecked "Asynchronous" , Paste your blog or side url in "URL to +1" field.
4. Then see the right side . Here has been shown two parts of codes . I named by "First Code" and "Second Code" .
5. Copy the "First Code", and go to Blogger Dashboard>Template>Edit HTML> Paste between <head> and </body> tag. then save. Just see below images to better realization .
7. Now paste your "Second Code" in the box below . then save.
Finally you have done . If you like this , Please don't forget to give me your + . Once again thank you so much.