How can I force Safari to close when it obscures a message of security breach?

I'm not familiar with kit Apple having always used machines BACK, Windows, UNIX and Linux. Picked up this Mac second hand for watching old DVDs, but my husband connected to our router without having been asked by our security software and it immediately caught a virus. If you can help with instructions for forcing Safari closed shot and stopping the awful high-pitched noise of shouting the virus is the cause I would appreciate it a lot. Thank you.

Order esc option Force an app to close on your Mac - Apple Support

Tags: Mac OS & System Software

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