To change your Facebook password on Android, open the Facebook app and tap the menu icon (three horizontal lines) at the bottom right, then scroll down and select Settings & Privacy > Settings. Next, tap Password under the Security section, enter your current password, then type your new password twice to confirm it, and tap Save Changes. Make sure your new password is strong—at least six characters with a mix of letters, numbers, and symbols—and avoid using easily guessable information. If you can't access your account, tap Forgot Password? from the login screen to reset it via email or phone number. After changing your password, you'll be logged out from all devices for security reasons, and you'll need to log back in with your new credentials. Consider enabling two-factor authentication afterward for additional account protection: go to Settings > Security and login > Two-Factor Authentication and follow the prompts to add an extra security layer using an authenticator app or SMS codes.