the technique is shaped like a horn, not horns ^_^ other than that, you did fine.
For the next technique, you need to have a sword. You channel your lightning chakra into the blade, increasing its cutting capabilities as well as slightly increasing it's range, you then let go of the blade and allow it to levitate in front of you. Once that step is complete, you make two physical copies of the blade (made entirely of focused lightning) which will float either side of the actual blade. You then, using your chakra force the three blades to begin to spin rapidly on the spot, once the blades are spinning you can use your hands to control them, making them fly through the air in order to cut your opponent or anything else you want to cut. Whilst you're controlling the blades, you CANNOT do anything else.