Contacts can hold email addresses.
In the Edit contact screen click the Emails tab.
Click the Add email button. The Email table is loaded or has a new row generated if an email already exists.
Enter an new email address in the Email edit field.
Specify a Use type for this email address. Use type definitions are reserved for administrators and users to establish.
Click the green update check icon. The email address is added to the table. The Add email button reappears.
Click the Save changes button at the bottom of the page. The new email address is written to the Registry.