I'm posting this here as opposed to 'Private Flying' (cos I seem to be asking way too much recently

)
It's with reference to: ENR 1.11 — ADDRESSING OF FLIGHT PLAN MESSAGES
I just don't get it. When filing a VFR (paper) flight plan, what is "addressing"? How does one "address"? and on what occasion does one HAVE TO "address"?
Cheers.