4
Go into your site's administration area. Click on:
Preferences-->System-->General Settings
Look for "Update module template .html files from themes/your theme/templates directory?"
Set it to "Yes"
Click "Go" at the bottom of the page
Go to the page you want to edit and refresh it. Your changes should be visible.
Don't forget to turn "Update module template .html files from themes/your theme/templates directory?" back to "No" if you're satisified with your changes.