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No plug-in needed for this. Just open your theme files using the WordPress theme editor or via FTP. Look for the code that is being used to display the notice. It should be in the index.php file, maybe in a content.php file if your theme uses that, and in some cases it’s in your functions.php file. It will use the exact text you’re talking about so it should be easy to spot. You need to remove that or comment it out so it doesn’t show. If you find it but can’t remove it post it here and I’ll help you out.

If you are using a public theme post the name here and I’ll have a look.