Modify FacebookLike button Extension to have Google +1 Button on your every post.

First Login as Administrator in your hosted BlogEngine site:

Now Click on Setting—>Custom Code and paste the below script as seen below:

<!-- Place this tag in your head or just before your close body tag -->
<script type="text/javascript" src="https://apis.google.com/js/plusone.js"></script>

Now Edit the FacebookLike.cs in your “App_Code\Extensions\” folder of your website

Find and Replace Below:

if (Convert.ToBoolean(bSettings.Tweet))
       {
           string tweetUrl = string.Format(tweetButton, HttpUtility.HtmlEncode(post.AbsoluteLink.AbsoluteUri),post.Title);
           sBuild.AppendLine(tweetUrl);
       }

With:

if (Convert.ToBoolean(bSettings.Tweet))
       {
           string tweetUrl = string.Format(tweetButton, HttpUtility.HtmlEncode(post.AbsoluteLink.AbsoluteUri),post.Title);
           sBuild.AppendLine(tweetUrl);
           sBuild.AppendLine("<g:plusone></g:plusone>"); //+1
       }

Make Sure Show tweet is enable in your FacebookLike Extension Setting:

Click on Extensions Tab as below from Admin Section

Now Click on edit from the dropdown menu as shown below

Make sure “Show Tweet Button” checkbox is checked and clik on save button

Now Log off from here and check your post. You will find Google +1 Button started displaying on after every post along with tweet and Facebook Like Button:

 Cheers !!!