The Color Splash action (see part 2 of the process notes https://ozone.oscraps.com/gallery/showphoto.php?photo=368530&title=process-notes-for-wantspart-2) requires an original "Background layer" and a layer that tells the action what to target called "brush" (no quotations). Here's what I did to get those two layers (step 4, in green).
Links:
Ink Smudge tutorial https://www.youtube.com/watch?v=Gq3FEF5CJuE&t=60s youtube.com/watch?v=Gq3FEF5CJuE&t=60s
Ink Textures used (I tried some other big ink blots from my stash, but none worked quite as well as these recommended by the tutorial): http://loadus.deviantart.com/gallery/23580195/Textures loadus.deviantart.com/gallery/23580195/Textures