I don’t remember my old password how can i chamge it?

Which password did you forget?

• For your Apple ID→If you forgot your Apple ID password - Apple Support
• For locked notes, there is no possible way to recover notes if you have forgotten the password. You do get unlimited guesses, however.
• For your iPhone screen lock passcode:

If your device has iOS 15.2 or later installed, you can reset it without a computer; check out this link→How to reset your iPhone, iPad, or iPod touch when you forgot your passcode - Apple Support. Otherwise you will need a computer:

See this Apple support link→If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

Or watch this companion video ⬇️

After restoring the phone using one of the methods above you can restore your most recent backup.

Assuming that you were reading the related article in the upper left corner of this web page and if you are asking about your Notes password, it cannot be reset if you forgot it. Apple cannot recover the password either.

You can create a new password for notes that create moving forward, but the new password will not work on the old notes.

See this for more information.

How to lock or unlock notes on your iPhone or iPad - Apple Support