To help control a nosebleed you should have the person?

To help control a nosebleed, you should have the person sit up straight and lean slightly forward to prevent blood from flowing down the throat. Instruct them to pinch the soft part of their nose with their thumb and index finger for about 10 minutes without releasing pressure. Applying a cold compress to the nose or the back of the neck can also help constrict blood vessels. Avoid having them lie down or tilt their head backward, as this can lead to swallowing blood.