With the websites that are built on simple platform or framework like PHP, .Net... It's very simple. Let's follow the steps that I write below:

 - Log into Dashboard page > Settings > Installations

You will see the embed code in the right hand side. What you have to do now is just copy and paste that embed code into your website's source code.

Image: Installation Menu

Now reload your website to see the widget displayed. 

The blank in the end of the page is the place where you can paste your website address to check if Subiz Live Chat was integrated successfully or not

Can I add code to multiple websites ?