l forger my passcode of my iPhone

I understand that you are referring to the passcode that is used to get to the Home Screen of your iPhone. You will have to reset the passcode to your iPhone by following the instructions in this guide published by Apple 👉 Reset the Passcode of your iPhone (Without a Computer).  Note: All the data on your iPhone will be erased.

Hopefully, you have a backup created on 👉 iCloud and/or on a computer. If you do then, you can 👉 Restore your iPhone from the backup file once your passcode has been reset and the iPhone has been returned to factory settings by the procedure in the link above.

Axel F.

Follow the steps in the support document you posted from.

it explains exactly what you need to do.

If you have an issue with those steps, the tell us what that is, and someone may be able to advise.