http://discoverygc.com/forums/index.php?showforum=38 - Discovery RP Factions.
This section, I believe. Just make sure you DON'T post it in Faction Creation Requests (since it is for officiality requests noly). And remember, unofficial factions CAN NOT create a recruitment thread in Facttion Recruitment Subforum. You can try to recruit in-game or via PMs (add a link to your post into your signature).