Pretty self-explanatory, here's how I did:
I had been a Pikmin fan for quite a while (since the second game came out) so I tried to find a site with news about Pikmin 3. However, since there wasn't much news about the game itself, I found Nintendolife's Wii U section near the starting of this year. After lurking for a while, I joined in June. 
(If there is already a topic like this, then feel free to delete this one.)