This is probably the name and password you use to log in to your Mac. If you’re asked for a user name and password, enter the name and password of an administrator account on your Mac.The Dock, showing the Trash icon on the right
Drag the app to the Trash, or select the app and choose File > Move to Trash.Or use Spotlight to find the app, then press and hold the Command (⌘) key while double-clicking the app in Spotlight. Most apps are in your Applications folder, which you can open by clicking Applications in the sidebar of any Finder window.
To delete an app that didn’t come from the App Store, use the Finder instead. Apps that don’t show an X button either didn’t come from the App Store or are required by your Mac.