how to delete virus application, how to delete virus application

There is no such thing as a virus that can affect an iPhone that is not jailbroken. If your phone is not jailbroken, you don't have a virus.

If your phone is jailbroken, you can't get help here.

What makes you believe that you have been infected? As KiltedTim points out, there is no malware that can affect a non-jailbroken iOS device. What problem are you seeing?

If you just want to delete some application that you don't like, go to the home screen and tap-and-hold on the app icon until it starts to "wiggle," then tap the x that appears on the top left corner of the icon. Press the home button to make the other icons stop wiggling.