I found it to be fairly easy to use. What features are you having trouble with? Also what do you expect it to actually do?

It's mostly a program that draws airfoils from coordinate tables and can do some of the very basic features related to producing the layout and ribs for tapered wings and blended airfoils. But what it produces in that respect is very basic. You still need to copy it into a CAD program to draw in ailerons, wing attachments, dihedral joints and bracing and other such features. Profili is not intended to be a full soup to nuts design tool.