How do I delete Tapsnake virus

That's a scam, not a warning; there probably isn't any malware on your computer. The instructions for removing the message depend on which application you encountered it in; for Safari, choose Force Quit from the Apple menu, close the browser, and then launch it with the Shift key held down. If the message reappears, disconnect the computer from the Internet and close the tab the popup came from.

(138188)

You don't have a virus. It is a phishing scam trying to get you to download or give up personal/financial information. Do not click on anything nor allow them to install anything.

Force quit Safari then while pressing the shift key launch Safari.