Having trouble adding JavaScript code to code block successfully

I hired a coder to code a word carousel for me via JavaScript (see below).

//javascript code

var words = ["Be seen", "Celebrate", "Be bolder", "Connect", "Pursue", "Be uniquely You", "Think Limitless", "Expand Deeply", "Fly Further", "Lead with Love", "Dream again", "Impact"];
      var currentWord = 0;
      var slideInterval = setInterval(nextSlide, 500);
      function nextSlide() {
        document.querySelector("#slide").innerHTML = words[currentWord];
        currentWord = (currentWord + 1) % words.length;
      }
 

I've copy and pasted the code into the code block. 

• I've chosen HTML, disabled Display Source code, saved, and opened an incognito window it only shows the code.
• I've chosen the JavaScript option and saved and I still have the same issue.

I'm sure there's an easy fix.  Any help would be appreciated.

3 minutes ago, Shermain said:

I've copy and pasted the code into the code block.

JavaScript code should be inserted between <script> and </script> tags in HTML.