>>17018162first you write a prompt, i.e. whatever you want the AI to generate like for example "dark post-apocalyptic wasteland, pepe the frog wearing power armor"
you can choose to either use a reference image or you can let the AI do whatever it wants but results can be anything, good if you don't have anything particular in mind
then there's also a bunch of other settings to mess with but that's the basic gist of it.