If someone is missing, the first step is to remain calm and gather as much information as possible about the last time they were seen or heard from. Contact family, friends, and acquaintances who might have had recent interactions with the missing person. It's crucial to contact local law enforcement authorities immediately to file a missing person report, providing them with all necessary details such as descriptions, photographs, and any relevant personal information. Additionally, consider utilizing social media platforms to spread the word quickly within your community.