Add code to my wordpress website

Hello, I subscribe to a tool that identify anonymous visitor on my website and to setup it, I need to add the following code to all my pages : <!-- Lead the Way --> <script type="text/javascript"> [login to view URL] = function(){init_multiplegl('[login to view URL]',[['[login to view URL]','2327','o1qbvtewg4']]);}; </script> <script type="text/javascript" src="[login to view URL]" defer></script> <noscript><img src="[login to view URL]" style="border:0;" alt="" /></noscript> <!-- End Lead the Way Code --> Here are the instructions : Paste your code extract followed below (unchanged, in its entirety) before the closing tag on each web page of your site you want to follow. So I need someone to : • Setup this on my homepage, • Explain how I can add this to my 5 others pages, I use a child theme. It's very easy for someone how knows html but it's not my case. Thanks,