Add Connect width Google+ to Blogger blogspot

hello,
i want your feedback about add "*Connect width Google+*" to Blogger 
blogspot like as this blog :
http://bloggercode-blogconnexion.blogspot.com/

i'm trying mush more but is not success :(
how i can get Client_ID??
https://developers.google.com/+/web/signin/

<span id="signinButton">
  <span
    class="g-signin"
    data-callback="signinCallback"
    data-clientid="Client_ID"
    data-cookiepolicy="single_host_origin"
    data-requestvisibleactions="http://schemas.google.com/AddActivity"
    data-scope="https://www.googleapis.com/auth/plus.login">
  </span>
</span>

plz help me

thank you.

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