FAQ 048. What's the/my postmaster address?

Its you domicile/home address
You are 'the post master' ,as you are sovereign and what you say-decree is law in the land and soil jurisdiction.
note:-
When you send your documents recorded delivery :-
The tracking number allows us to use the postal service as a court of records, and as such is recognised by the air Ecclesiastical and water admiralty and maritime legal system. 

Simple well explained download- print and have this with you whilst you fill out your documentation (recommended!) https://tinyurl.com/y2bnrztj  (it's on drop box)