I need to create my character and some npc’s but I don’t know how to access the editing software.
If you mean the animation rigging toolkit, for Maya, it’s in \UnrealEngine\Engine\Extras folder in the UE4 download.
I found that folder and I have the files but I don’t have anything to run? I don’t have Maya.exe or however you run Maya.
Go to Autodesk for Maya support