My guess is that once you actually receive the boxing certification and earn the CECs, you will have the information you need. You didn’t mention if the boxing cert is with ACE–if it is, they automatically update your account.
Otherwise, you should contact ACE directly.
I haven’t heard of the course. Which organization are you taking the course through? If it is an ACE approved course (the course is registered with ACE and on their approved provider list), you can contact them directly when you have completed the course and someone will put the course on your account. They are really great with customer service, so don’t hesitate to contact them.