How do I become a rakeback affiliate on FTP?

[xSCWx]

I have 2 friends thinking about getting started on FTP. I never did the whole rakeback thing on my account but one of my friends somehow affiliated me?

What do I need to do to affiliate them and get them the 27%?

Thanks, sorry if this is a repeat which it probably is but I didn't see anything about it within the first 3 pages.

Edit: Added FTP to the title.