Anyone know how to get those yellow stars that the administrators have?

The more post you have the more stars you get. After about 100 posts I think you get your first star. You have to either post a lot or be a moterator to get all 5 stars. :)

How do you become a moderator?

Well the owners of these forums approached me and asked if I'd like to partner with them. If I put a link to this forum up on my site I could moderate the G20 forum. That's how I became a moderator. Believe me it's no biggie unless you want to edit threads or have 5 full stars under your name. :)