Please help this Virus popped up what do I do

Your phone does not have a virus. Close the message and delete it.

This is a well known complete total scam that is trying to trick you into buying useless software that will do nothing to help your phone or worse.....trick you into providing personal information for the bad guys.

NEVER click or tap on a link like this.

If you see other messages like this, delete them immediately and move on.

All such messages are scams presented by criminals. Close the offending page and avoid sites that are involved in such bogus advertising tactics.

https://discussions.apple.com/docs/DOC-8071

You are welcome.