As a new member with fewer than three posts you're under certain limits, but you can certainly post in the Flute Forum. After your first three posts have been approved you will have full permissions, which means you may post without prior Admin approval, you may send and receive Private Messages, and you may post in the Used Instruments Exchange.
Please read and familiarize yourself with C&F's principles. They're in the so-called
CCCP (← link). It's at the top of every page, and it should tell you everything you need to know about how things run around here.
