Just a general note if you want to find out what a mac address is of the device you have connected. If you need to find out what your mac address is to put into a router then make a note of what your connection is called (e.g. Local Connection 1) or rename the connection so that it is obvious.
Then open a command prompt window (Winders +R then enter CMD and hit enter)
At the prompt type ipconfig /all this will return the information about all your interfaces - find the section for the connection you made a note of above and the value in the Physical Address: is the MAC address you need to allocate.
If you are a cable modem user do not mix up the MAC address of the cable modem with the MAC address of your network card - your cable provider will only ever be interested in the mac address of the cable modem and there should be a sticker on the modem with this. If you then install a cable router you would use the cable modem mac address to spoof the device on the cable network.
Any wireless network will only be interested in the MAC address on your machine itsef so ignore the cable modem mac address.
Cheers
Jof