The process for filling out the nanorep form is on the FAQ
The initial 'Ask an agent via email' link/icon after the first search somehow disappeared earlier this week.
You are now presented with a second layer of categories to pick from that leads to related topics. At the bottom of the list of topics is a very small 'If you cannot find your answer, Please click here.' link, which presents the Nanorep form.
I think they are just trying to cut down the amount of mail quries they receive due to improper or half-hearted searches.