Just when you thought you had everything covered for your first season of racing, more stuff crops up.
Like.... pinning your number on.
Once you figure out which side it goes on (based on which side of the street the officials and camera will be located), then you need to properly orient it so that the officials can read it.
Now, the actual pinning. There is no ceremony for this.
Here are two different methods:
The first one is the correct way. It keeps the number from becoming a parachute. It also prevents it from ripping your jersey to shreds.
The second one is the way to do it if parachuting and ripping is part of your race plan.
Seriously, it may seem like minutia, but it's just one of many little helpful hints.