Sorry, but still: NOTHING

I copied your code from the forum, I’ve inserted it into the functions.php of the Enfold child theme (I also tried Enfold main but still no success).

Then I changed the parameter and added the code into my page using text element (since it didn’t work, also code element). In the preview you can see the item but as soon as I upload it there is nothing but a blank area with a border.

What do I do now? Why is this so difficult?
Thanks in advance!