Some applications may contain an particular uninstaller on their install packages, you can try to open the package to check whether there is an uninstaller of the applications. Uninstall Toast Titanium 15.1 via its uninstaller
Easy-to-follow guides to uninstall Toast Titanium 15.1 for Mac 1.
If you are a newbie of the Mac computer, you might be not clear about how to start and complete the removal on the computer, because the macOS does not provide any sort of removing feature or utility like the Windows does.