How to enable Google+ counter ?

How can I get my Google+ ID?

You need to get your Google+ page or profile ID. If Your page Link is something like http://plus.google.com/+psdtuts/ the ID will be+psdtuts , if Your page Link is something like http://plus.google.com/106192958286631454676 the ID will be106192958286631454676

How can I get my Google API Key ?

• Create a project/app in https://console.developers.google.com/project following these steps:
  
• Add the API key in “YouTube API key” field in YouTube Arqam Settings box, and don't forget to enter Google+ ID as mentioned above.