First, this is the wrong section. Second, try opening your crafting table, pressing the recipe key over the wrench, and then the question mark that shows up. It should create a nice pattern showing you where to put the stuff. If that doesn't work then you should try removing the cache and running again. (In the launcher options delete cache.) Also, make sure that you are using the right item for covalence dust. charcoal with 8 cobble for low, redstone and iron for medium, coal and diamond for high.