Can't locate a smarty code wrongly entered

By mistake I have entered a smarty code which appear on categeries and products.
When I try to identify where/ which folder it is, I don't know where it can be located...

Can someone help me out how to identify where this code went? I know on right click that it's on line 503 but where/which file ...H3. I named it as Link

https://www.firstads.biz/classifieds...and-shoes.html
Link
* Name: link_urls
* Purpose: performs a regex and replaces any url's with links containing themselves as the text * This could be improved by using a better regex. * And maybe it would be better for usability if the http:// was cut off the front? * @author Andrew * @return string */ function smarty_modifier_link_urls($string) ?>

Hello,

This code is located in Content > Content Boxes > Link > Edit > Content

you need to use PHP in 'Box type'

Rudy, you're a star. So I can imagine that I can add a banner instead...