How do i check my iphone for a virus

You don't need to and can't; Apple's built-in defences prevent malware from affecting the unit, and any scanners from checking files other than their own documents.

Unless you manually uploaded a file to the website, that's a scam. If you did, delete that file or scan it from a computer.

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Good choice on not pressing it, it is a scam attempt. They are trying to sell you some useless software you do not need. Your iPhone is not susceptible to viruses. If you get another one of those scam attempts, which you inevitably will, do not interact with it and close out of it.

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

Ericaaaa128 wrote:

I went on a website and it randomly said that my device got infected and it had a ok button but i did not press it

That would be an advertisement.

An advertisement that lied to you.

Also known as a scam.

The ad is probably offering a sketchy VPN product given recent reports, a product which (ironically) doesn’t even address the issue the that the advertisement (falsely) claimed to have detected.

Some of the many scams:

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

You saw a message designed to scam you, either by

• Getting you to buy some worthless "security" app that would do nothing to fix the alleged problem, or by
• Contacting criminals posing as "tech support" for "help". (The only "help" you would get is help in being ripped off.)

Your phone is fine and does not have a virus. You simply saw an ad attempting to scare you into downloading their software that claims to fix a problem you do not have.