i need an answer please!

[maynald]

Submit all materials by MAIL in a single package. Application Quote your number on your correspondence and send the package to one Of the following addresses:

Canada Post:
CPC - Ottawa
PO Box 9780
Ottawa ON K1G 4B9


Can someone explain this to me please,What does , Application Quote your number on your correspondence means please?
I just received my pppr today,but im having a hard time understanding this.Should I write my application number where?

 

[ferna]

I wrote my application number on the envelope. Just bellow the address label.

 

[maynald]

oh thanks,at least I have an idea now