I have forgotten my Apple passcode

Passcode or password?

See the Apple Support article(s) below. 

Passcode - If you forgot the passcode for your iPad or your device is disabled.     *

If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password on the sign in page. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.

Apple ID - Manage  -     

Apple ID – Forgot Password  *