To Change the Registration:
1. Edit the File "EDIT_REGISTRATION.psd" in Photoshop or GIMP.
2. Convert it to DDS (You can use nvidia texture tools for that.)
3. Replace the File: "A320NEO_COCKPIT_DECALSALPHA_ALBD.PNG.DDS" in your A32NX/SimObjects/AirPlanes/Asobo_A320_NEO/TEXTURE/ Folder.