That confused me a bit, too. I emailed them and asked if conference poster presentations should be listed in the publications section, but that question was in an email with several questions, and they ignored that one. (I have my posters on my CV, though.) I've tried to ask a number of questions that I haven't gotten clear answers on, and found some bugs in their Survey Monkey web forms that they seem to have fixed now. I called once, and the person who answered the phone sounded like a general receptionist/tech support who knew less about the NDSEG than I do.