How can u find out ur own or someone else's MAC address?

Your own MAC = Goto cmd and type in "ipconfig /all"
MAC address looks something like this : 00-13-20-A3-0B-4C
Someone else's MAC address you need their IP address and then goto cmd and type in "nbtstat -a 192.168.0.5" or whatever IP they use. This will show you their MAC address as well as their currently logged on user.