A website cannot possibly scan your Mac for viruses. If they claim they can, and if they also claim you have viruses, then they are lying. Simple as that. Most likely they want you to spend money on some virus checking app that you don't need, which means you waste a bit of money. Or they want you to pay for a service that supposedly removes those viruses from your Mac, which means you spend a lot of money and give some scammer access to your computer.
As a reaction to this site, you should do NOTHING. Especially you shouldn't contact them, you shouldn't get anti-virus software from them, you should most definitely not install any software of theirs.
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Move to trash, then "empty trash".