How do I delete the theme credits in the footer?

Hey there, I’m using the ElegantWhite theme by Fimply. I want to delete the credits in the footer and replace it with my own Copyright notice and so on.

I went to the editor, and accessed functions.php. here is how the code looks like:

// Footer elegantwhite 

function elegantwhite_footer_text() {
$ew_text = 'Theme: elegantWhite by <a href="https://fimply.de">Fimply</a>';
echo $ew_text;
}

I tried tweaking with this but either modifying or deleting any of what’s in there resulted in my site being completely broken. I couldn’t access anything, all I saw was a blank page (both front and back ends). So I had to access my file folder through my host’s cPanel and delete the theme.

So I’m a bit confused. Where can I delete the theme’s credits and replace it with my own text/links?

Many thanks!!