My i phone security lock out

You were looking at the Apple Support document above your name. That would be what you want to use if you have a Mac or PC. Here is that document again below:

If you forgot your iPhone passcode

If you do not have a Mac or PC, you can try to reset the phone without using a computer using the Apple Support document below:

If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support