Ok.
There's a little blank over -->
called Search. Your question has probably been answered a bazillion times.
Hmm. Advancing tiers? Might try 'promotion tiers'
There's also an FAQ section, off to the right and down a touch. Really not as useful as search but still a good resource.
Yeah.
I'm in one of my moods.
Just kinda tired of seeing the same questions over and over and over and over.....