Hi Chelsea, if your can't uninstall Yahoo community toolbar using Control Panel try using third party tools -

CCleaner
Download, install and run CCleaner. After launching the program select "Tools". In the uninstall programs list select the program you want to uninstall and click the "Run Uninstaller" button.

Revo Uninstaller
Download, install and run Revo Uninstaller. After launching the program select the program you want to uninstall from the list and click on the "uninstall" button.

IObit uninstaller
Download, install and run IObit Uninstaller. After launching the program select the program you want to uninstall from the list and click on the "uninstall" button.

After uninstalling Yahoo Community Toolbar and removing it's plugins from your Internet browsers (following this removal guide https://www.pcrisk.com/removal-guides/7913-yahoo-community-smartbar), scan your computer with Malwarebytes Antimalware and Spyhuter. https://www.pcrisk.com/top-spyware-removers