Polyps, and other softies, do tend to move around if not attached to a piece of rock. Noit necessarily a bad thing if you have a bunch of polyps-they will find a good spot, and set up home if they find a good spot. Since it sounds like you do have just a single polyp, putting it into a little plastic tub w/rock bits is a good idea. I assume you have at least some rock? You can take a piece out and hit it with a hammer to make some little bits for the polyp to attach to. A soft drink or water bottle will also work-cut off the bottom couple of inches of it, cut some holes in the side of it, and place the bottle bottom with rock pieces and the polyp into your tank. Once the polyp does attach itself to a bit of rock, then you can superglue it pretty much anywhere you want to.
Love my torch coral-one of my faves. Post some pics when you have the time!
P.S. Love your avatar-almost as cute as my pup Goldie-the one on the left in my avatar!