You can change most of your personal information including your address and emergency contact through the employee portal  . Go to CU Resources > Personal Information > Employee Profile. Due to CU's new security that verifies who you are through your phone number, please contact your department to update an old phone number if the system will not allow you to update it.
For information on changing your direct deposit click the link: Direct Deposit 
For information on changing your W-4 click the link: W-4 Form