Just plug it into the bracket; easy to use.Simply pass the needle through the hole of the opening and insert into the bracket. However, if you use it for a long time, the contact may be loose. If you mind it, you can replace it with a new one every time. Caution for Use: Do not stick to your hands or fingers due to the sharp needles. Also, it is small, so it is hard to find if you drop it. Be careful not to lose it as it may cause injury on your feet.