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I was the one that did the original template modification (Admin->Appearance->Template modifications) and I can verify that what
Ozzy47 gave in this post is 100% correct.
I was just looking for this template/warning option.
snogssite.com
And there are no other edits.
If you copied the "Find" info directly from what he posted, that could be the problem. XenForo converts tabs to spaces in posts. What he posted should be copied directly from the main template so the tabs are used. Otherwise, the "Find" will never match anything.
And you you are editing the template itself, you shouldn't be. That's what "Template modifications" are for. And what was given in the post won't help you at all because $0 does not exist in an actual template. $0 is a template modification variable for the original "Find" value.