Obtain the installation code for your site from the Dashboard in Cliengo. This will redirect you to a page with the code. Simply click on the code, and it will be automatically copied to your clipboard.
Enter your Admin panel on Blogger.com and select the blog to which you would like to add Cliengo. Once selected, click on Template in the menu on the left.
Then select "Edit HTML".
Now, look for the HTML </ body> tag and above it, paste the Cliengo script as shown in the screenshot below.
Click on "Save Template" and Cliengo should start working!