How do you change info in your iCloud Keychain

When password is changed from iPad Change weak or compromised passwords on iPad - Apple Support and iCloud Keychain is set up on other devices Make your passwords available on all your devices with iPad and iCloud Keychain - Apple Support

Set up iCloud Keychain on an additional device

When you turn on iCloud Keychain on an additional device, your other devices using iCloud Keychain receive a notification requesting your approval of the additional device.

On one of your other devices, approve the additional device. Your iCloud Keychain automatically begins updating on the additional device .