To change your Citibank online login password, log in to your account on the Citibank website. Once logged in, navigate to the "Profile" or "Account Services" section. Look for the option labeled "Change Password." You will be prompted to enter your current password, followed by your new password, ensuring it meets security requirements. Confirm the new password and submit the changes. After successfully updating, you may want to log out and log back in to verify the change. If you experience any issues, contact Citibank customer support for assistance in resetting your password.