To get started with Leadsius its vital that the script is installed on your web site.

Copy the Leadsius tracking code and Paste it into every web page you want to track, just before the closing </body> tag. If your website uses templates to generate pages, enter it just before the closing </body> tag in the file that contains the <body> section. 

If you're not responsible for maintaining the web site, send the script and instructions to the person responsible.