iTunes Password Change = How?
How to change my iTunes (media and purchases) password in macOS 26.2.
MacBook Air (M2, 2022)
Unless you are using a different Apple Account for iCloud than for Media & Purchases, you should be able to change it in System Settings ➜ Account ➜ Sign In & Security ➜ Password ➜ Change Password.
If you are using a different account for Media & Purchases than for iCloud in the previous menu, then you will need to log in at https://account.apple.com with the Media & Purchases account and change the password there.
click here ➜ Change your Apple Account password - Apple Support