You can now add the Google Plus button to the bar across the top of your website, as well as add the button below the title of any individual page.
1. Go to Settings
2. Click "Google Webmaster Tools"
3. Change "Google Plus" to "YES"
If you also want to manually add the button to a specific page...
1. Follow steps above
2. Open the specific page in your admin
3. Click the HTML button in the description box
4. Paste "{google_plus}" in the top left corner (do not include quotations)
5. Hit UPDATE to close the HTML window and then SAVE the page.
This is how it will appear under the title: