If your application is already active, you can go to www.academyadmissions.com
and click on the "Application" tab. It will take you to the secure application site. From there you can log in to see the status of your application. On the information listed, there is an option to update or edit your information. You can sometimes do this online, other times you must contact your admissions counselor. The contact info for your admissions counselor will be on the application page, also. You can use this to add information throughout the application process.
I don't know about contacting the tech department instead of admissions. I really don't think the tech people have anything to do with your application. I believe that the best way to correct something is through the admissions counselor. You won't look like an idiot, rather you will look like a candidate who cares about getting into the Academy, and is willing to double check his or her work, and make corrections as necessary.