You cannot "move wings back", as they are fixed by the shape of the 3D model. You can, however, change the location of the cockpit model in relation to the external model. You can do so by first opening the model's cockpit.ini file in notepad, and then scrolling down to the "cockpitseat" section, where you'll find a declaration such as this: "Position=0.0000,4.339,1.27"
The coordinates are based on the X (left to right), Y (front to back), and Z (up and down) axis.
In the case of a tandem seating arrangement, The X coord is usually left at 0. If the aircraft has side by side seating, then the pilot's seat is moved left, in which case you use a negative value. The Y coord is based on the distance from the longitudinal centerline of the model. Positive values denote offset from the center, negative, behind the center. The Z coord is likewise a negative value below the vertical centerline, and a positive one above the centerline. All values are in meters.
A tip: Look at the pilot's position and sight line in the external model, and use that as a guide for realistic placement.