okay ill try to explain but not very good at it here goes:
1. After u edit ur save and click file save the editor will say it has rehashed the save
2. Then u can close the editor
3. Then u need to go the folder or place where u downloaded the editor
4. When u are there, there should be a folder that say modded_ff13_save
5. In that folder is where the modded save is, that is the save that u put back into ur 360 using whatever method u used to get ur original save out of ur 360
6. U can do this by using modio or concept or usbxtaf, i use modio cause it is easy to use
Sorry if this is confusing but hope this helps and if not try sending genesis or sepiroth a private message and they should be able to help better than i can