Under the category of "Aircraft" you should find all three primary axis. Now we go into IL2 and into the Controls menu, then into the axes menu.
This means that the virtual joystick is currently in use. Once this is clicked, you should notice the axis on the preview panel on the right start to move by itself. First click this button (Virtual Axis Test Loop), this needs to be done for each of the axis, but one by one. We need to use our newly created virtual joystick instead of your default one. The light green is your raw joystick input and the darker green is your virtual joysticks output, or in other words, the way your joystick will handle in game after applying those settings, to see this in action, simply move your joystick. To the right of the screen you can see the preview window, this is where you can test the joystick and view the feedback of your profile. Once you have each axis bound to your joysticks axis, you can go ahead and start modifying each axis to your liking. You need three tabs in total, one for each of the primary axis, each of which need to be bound to the virtual joystick (See below for examples) You can do this by changing the Source (Physical device) to your joystick, in my case my Logitech Extreme 3D Pro. The first step is to bind your joystick to the virtual joystick. This is the window where you will be modifying your joysticks curves. You should now be greeted with this screen: You can launch the application by using the original setup.exe you downloaded. After you have finished downloading and installing both pieces of software, go ahead and launch Joystick Curves.