How to get a free top-level domain name?

Tokelau brought a plan to introduce him on Web. OK, who is Tokelau? It's a small island (more several small islands?) country near New Zealand. I have never heard it several months before. The same goes on most people, I think. Now, their project to provide free .tk top-level domain name works.
To get your .tk name, plz:

1. Goto its website and follow instruction to apply
2. It will ask for a Ambassador coupon number, you can use 172818