how do I change my keychain password?

Hey There 🙋🏽‍♂️

If by that you mean changing the Passwords of Email/Accounts that are saved in your iCloud Keychain, Simply:

• Go to Settings
• Tap on Passwords
• Tap in your passcode/ Face ID / Touch ID
• Find the Account you’re looking for
• Top right of your screen tap “Edit”

And just like that you can change the Passwords in your iCloud Keychain.

If your issue includes Keychain on a Mac please have a look at this:

https://support.apple.com/en-gb/guide/keychain-access/kyca2429/mac

Hope this was helpful !

Best,

Aryan