Initially there is only one way to earn Greenbacks - make a post on our forum. One post, one Greenback, simple. Your post will appear immediately, but you won't be credited with a Greenback until we complete our spam-sweep each day. Sorry, spamming gets you nothing (and might get you banned). Instead, go get involved in conversations.
Start a new topic, reply to an existing one, help out other commenters, enter a competition, everything counts!
Check out the forum to get involved.