I'm a college student, and with that comes internet constraints. We have a packet fence website to register gaming consoles and other various MAC addresses. Anyhow, I got Astroprint on the pi and it works with the local hotspot it creates. But to get it on the internet I need to either hardwire in (ethernet) or connect to the wifi, which all I have to do is register the wlan MAC address with the packet fence. But I'm having trouble finding the MAC address of my Pi. So any help is appreciated, I am a beginner when it comes to the raspberry pi stuff, so I just need a little extra help. Thanks!