Please note that our support team cannot assist in troubleshooting custom code.
If you want to add a script for a particular page only, you'll click on the Pages tab at the left -> the page you want to add the script to -> SEO & Page Settings.
From there, click on Head Section and enter your script in the text box, between <script> and </script> tags.
You can get more information about the HTML feature here. Again, be sure to enclose your script in <script> and </script>