Categories Dressing

[gjh42]

I guess I need to ask what folder the copy of tpl_categories.php that you have been editing is in.
You have the Classic template active, so all modifications and additions need to go under that. Change "your_template" to "classic" when placing files in this case, as the readme instructs.

You will also need to learn about the template override system (see FAQ/tutorials) and set up your own template.