How can I remove a potential virus or setup Apple Store appointment?

Those strange messages are scams. Unless you have jailbroken your iPhone, there are no viruses that can infect it.

What happens when you try to delete your email? Are you getting an error message? If so, what does it say?

Everyone gets messages/emails saying you have a virus. They are just ads attempting to scare you into believing what they say and download some software to solve a problem you do not have. Obviously they want your money. They just need deleted, or you can report them if you wish:

Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support

We can further investigate the email issue you are having with more information, or you can follow this link to schedule an appointment. Just scroll to the bottom where is says Get Hardware Help.

Genius Bar Reservation and Apple Support Options - Apple

“Possible virus on iPhone 15 amy iPhone 15, so I need to set an appointment to the nearest Apple Store?: I’m concerned that I may have a virus on my iPhone 15. Email won’t delete, strange messages saying a virus is attacking my iPhone.”

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iPhones don’t get viruses —so, you’re fine; not Genius Bar Appointment needed.

Why do you Ask? Did you get a message of sorts? If so, it is a scam, and you should report it: Using the Photos App to Report Scams: