You don't. All of the survivors are very old now and as all were children at the time of the sinking their memories of the disaster are very limited and have been well documented already, therefore individuals should not attempt to contact them under any circumstances. Milvena Dean is the only survivor actively involved with any Titanic society being a regular guest of the British Titanic Society at its annual Southampton convention. She sometimes conducts a question and answer session at the convention.
