Edit code in body text

Hello, 

I'm trying to add some code to one of the blocks in my website, directly in the text. At first, it seems to be working, but a few minutes later, the commands no longer work, and the code shows on the published website. (image attached) 

Is there any way that I can edit the text?

Thank you

Can you share link to this page?

Hello, thank you for your help. 
This is the link: https://www.comporta.art/ at this moment I don't have the code published because it was always with the same error. 

First, use this to Website Tools > Code Injection > Footer

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $(".image-slide-title").each(function(){
    $(this).html($(this).text());
  });
});
</script>

Next, try your <br> tag again

Sorry  @tuanphan  thought I had answered you, and only now noticed that I hadn't. 
It works perfectly, thank you very much for your help.