Artists

I use AI image tools like NightCafe to create backgrounds and artifacts for posters of public events. I've read AI analyses of some of my creative writing and then edited that writing in response. AI and creativity interest me. I figure you own the edited AI image in your post, because you made changes, but I also notice the image doesn't have a signature.
Are AI creations art, and how much must you change AI art before you can call it your art?