To use a tampon for the first time, choose a slender one to start. If you're unsure where your vaginal opening is, use a mirror to help. It may take a few tries to find the right angle for insertion, but don't worry, it's normal to feel a bit uncomfortable at first. Some people prefer pads or menstrual cups instead of tampons, so choose what works best for you. For more tips on how to use tampons, you can visit the Society of Obstetricians and Gynaecologists of Canada's website. Remember, it's all about finding what's most comfortable for you.