From the left side Menu, Select 'Reporting' and then 'Promo Codes'.
You will land on the promo code index page.
Choose the 'Current' tab.
To view usage of the promo code, click on the promo code name.
The number of uses, total discounted as well as the start and expiry dates are listed.
For RSVP Portal Promo Codes you can dig deeper by clicking on the code from this screen, and then viewing the details below.
Under the promo code usage heading, Click the 'See All' option
Than click 'Linked to Account' to view which accounts have added the promo code directly to their account.