Bloody nose- how to stop it

First press both nostrils together, one at a time, of course, then let it go and repeat this process for a few times. Then bend forward and collect the blood on a cloth. Don't ever bend backwards as you could choke this way. Then put some water inside your nostrils to make them damp.
Now the bleeding should stop. If it does not stop within 15 minutes, then you should see a doctor.