How to reset the passcode for an iCloud?

If you want to reset the Apple ID password, follow the steps mentioned in this article:

If you forgot your Apple ID password - Apple Support

In case this is about the passcode for the Lock Screen, follow the steps in this article to connect in recovery mode to you computer, erase your device and set it up again after that.

If you forgot your iPhone passcode - Apple Support

If your iPhone has iOS 15.2 or later installed, and/or you don't have access to a computer, follow the steps in this article:

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

If you're talking a about your Apple ID password:--> If you forgot your Apple ID password

If you're talking about the passcode to unlock your iPhone screen, see these instructions, keeping in mind that if you don't have a backup all data will be lost on that device (except those that you eventually synced to iCloud):

If your device is running iOS 15.2/iPadOS 15.2 or later, AND if you have created a backup to iCloud, you don't need a computer:--> How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support

Shouldn't be this case (iOS/iPadOS earlier than 15.2), you need a computer. If you don't have a computer, borrow one from your friends/relatives/neighbors or ask for help at an Apple Store or Authorized Service Provider, then read these suggestions.

Given that to remove the existing passcode you must connect your device via USB to a computer (a Windows PC running the latest iTunes version, or a Mac, which can run iTunes or Finder, depending on the macOS installed on it), pay attention to the specific gestures that you need to perform while connecting your device to the computer.

These are the instructions to re-gain access to your iPhone/iPad:

If it is an iPhone:--> If you forgot your iPhone passcode - Apple Support

If it is an iPad:--> If you forgot your iPad passcode - Apple Support

Also, take a look at this support video about the same matter (for both iPhone and iPad):

https://www.youtube.com/watch?v=7s8-zLG9ySQ

Regards

Giulio

try visiting

iforgot.apple.com

or reading this article

If you forgot your Apple ID password - Apple Support