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Hi,
If you edit the files, you need to update the module after that (from admin -> modules menu) and maybe clear the template cache (delete all files in templates_c folder except for index.html).
As alternative you can edit templates in database. To do that you need to clone the default template set in admin templates menu. The you need to tell XOOPS to use that new template set as default. And you will have option to edit templates from the XOOPS admin menu in templates section. You still will have to clear the templates cache.
Or you can use template override in XOOPS 2.0.14+. There was an article in the news explaining that...