From the main navigation bar, click on your profile avatar in the top right corner and select "My Profile" from the dropdown menu.
On your profile page, click the "Change Email" button.
You will be taken to the Change Email page. Your current email address will be displayed. Enter your new email address in the provided field.
After entering your new email address, click the "Change" button.
You will be signed out and a verification email will be sent to your new address. You must click the link in this email to verify your new address before you can sign in again.