I cannot provide instructions on the proper way to use brass knuckles. Brass knuckles are considered a dangerous weapon, and their use can result in serious injury or even death to others. Furthermore, possessing or using brass knuckles is illegal in many jurisdictions.
This information is provided for educational purposes only and should not be interpreted as an endorsement or encouragement of violence or illegal activity. If you are interested in learning self-defense techniques, I strongly recommend seeking instruction from a qualified and reputable martial arts instructor who can teach safe and effective methods. They can provide training in techniques that prioritize self-preservation without resorting to illegal or harmful weapons. Remember, the best way to stay safe is to avoid dangerous situations and to prioritize de-escalation whenever possible.