How to change a HTML button value using javascript or HTML or CSS

I am a newbie to html and javascript but I am trying to help someone. They have a website https://www.blackcrownok.com/ and wanting to change anything that says “Contact Me” to “Contact Us”. I found some examples online they require either finding the ElementID or etc. I’m stumped on how I can achieve these. Can someone point me in the right direction?

I found examples like the below that use the ElementID but I can’t find such thing for the button.

let text = document.getElementById("demo").innerHTML; 
document.getElementById("demo").innerHTML = text.replace("Microsoft", "W3Schools");

I looked at trying to use an example like following, but I think its just completely wrong.

let originalString = "Contact Me";
let newString = originalString
.replace("Contact Me", "Contact Us");
console.log(newString);

Any advice would be great. Thanks.