i struggling to where should i paste the code 

<link rel = "stylesheet" href = "http: // localhost: 8069 / im_livechat / external_lib.css" />

            <script type = "text / javascript" src = "http: // localhost: 8069 / im_livechat / external_lib.js"> </script>

            <script type = "text / javascript" src = "http: // localhost: 8069 / im_livechat / loader / 1"> </script>

please help me to do this.