Choose wings first and then your Trinkie body.  Double click each item in the order from bottom to top for proper layering.   It is not recommended to drag and drop items directly, but you can use the mouse to position the items after double clicking them to the build area.  Some people report a problem with the Save and Download function.  It that happens you can press Print Screen and then copy and paste your pixie into a paint program to edit. Have fun!