Those are the two points that define the wing profile the deicer will follow. It's way easier if you don't care about putting numbers, and use the graphical editor, to place the two points over the wing.
See the manual, there's a example picture at page 33, which shows how the two points should be placed. You don't want to go too close to the fuselage for the "In" point and not exactly at the wingtip for the "Out" point, but leave a bit of slack.
