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chelfyn:
It depends on what those changes are. If those changes create new variables, you need to assign those variables to Smarty variables and then call those Smarty variables in your template, that is, in your theme.html file or in the specific module's templates.
Another reason for not seeing those changes might be that you still have the old data in cache. You need to clear the cache in your browser, as well as delete the cached templates in the folder templates_c. This way the templates will be rebuilt.
Cheers.