You can advertise your coupon with a site-wide message.
1) Click 'Electronic Coupons' under the 'Commerce' heading of the Control Panel.
2) Under the 'Active Coupons' heading, click your coupon's 'Send' link.
3) Under the 'Send an Electronic Coupon' heading, next to 'To:' enter the email address of the person to whom you wish to send this coupon or select an email address from the menu below.
4) When you are finished, scroll down & click the 'Send Email Now' button.