The best way to update your email address is to log into Online Banking, click on the My Settings link at the top right and go to Primary email | Edit and you can enter your new email address there.
Remember, you'll need to change the email address you have on file for external funds transfer service as well. While in Online Banking, click on the Move Money tab, then To/From my other Bank Account (external) underneath and go to Settings then Emails. You'll be able to change your email address there.
If you have any notifications (such as a balance alert) set up through Online Banking, you'll need to change that email address as well. Simply hover over the Alerts and Notifications tab, click on Email and Text Alerts, then click Update under the old email address and modify your email address there.
If you are enrolled in Online Statements, after making the change, simply click on the Statements tab and your email address that receives the statement notifications will update to the Online Banking email address.
If you choose, you can use different email addresses for your notifications, external funds transfer and for Online Banking. You can customize it to fit your needs.