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First, welcome to XOOPS!
As a general rule, you should never edit templates directly. Instead, you should clone your default template set and set your custom template set as active, then make your changes in the new template set. This gives you a falback in case things go bad with your edits.
To ensure your changes take affect, set Preferences Main »» General Settings »» "Update module template .html files from themes/your theme/templates directory?" to "Yes".
Go into the Template Set Manager, go to System under your new template set and edit the system_notification_list.html template.
After you're done making your changes, set "Update module template .html files from themes/your theme/templates directory?" to No and enjoy.
Hope this helps.
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.