By "got my rubbermaid" do you mean you have a little rubbermaid food container or something of that sort? Well, you need to have an entrance. So either cut a hole in the side, or the top, or whatever. Then dampen the moss and put it inside the hide. Don't wet it where it's soaked or anything. Just damp. I haven't used the stuff, but I think it's absorbent like a sponge(?). So maybe soak the stuff, then ring it out a little, still leaving some moisture in it.