They have a list of the coursework you reported to AMCAS. I think the idea is that you select the course from a dropdown list, then when you move down to the specific course info, you select copy. The info from the top box is then copied to the lower box. I tried this feature and found it useless. If I were you, I would just ignore the copy function and type your answers directly.
Typical problem with database design, they are trying to make the interface too cute rather than simple.