My iPhone is disabled

If you forgot the passcode on your iPhone, or your iPhone is disabled or unavailable -

How to reset your passcode without a computer if you have iOS 15.2 or higher.

How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

How to reset your passcode using a computer.

If you forgot your iPhone passcode - Apple Support

The message on the iPhone is telling you that you need to connect to iTunes on a PC. Have you done this?

If you forgot your iPhone passcode - Apple Support