Tell me where I can see how to rinse my nose for a 3-week-old baby. We…

Tell me where I can see how to rinse my nose for a 3-week-old baby. We were told to rinse with a physical solution for prevention, as the crib is sick. But how to rinse it in general, I have no idea??‍♀️I've only learned to clean the nose, and even then it resists.