My waterfall disappeared in edit mode

Nothing I do can target the two waterfalls I placed, and while they are still there in game mode, I can’t move them to where I need them to be. Same with my fire and my splash animation. Is there a way to fix this? Can I at least get rid of them so I can put new ones down?

You should be able to select them in the Hierarchy Window, and do what you want with them from there.