A 12 step treatment program followed by participation in a program such as AA or NA is most effective. Just call a rehab or treatment facility and ask what the next step would be. Just do a web search for drug rehab. If its gambling, shopping, or another addiction just insert that word for drug. I don't think YouTube would help for this. I just saw the issue is cutting. This would fall under the disorder self harm. Community Psychiatric ( don't go with psychic) hotlines are available. They would be able to advise you as to what the next step should be.