You can now connect to BSSDInternet without these instructions. But to find your MAC address for other reasons:
Iphone/Ipad
Browse to your settings - select General and then About:
Android
Hardest one as each flavor of Android is different. Many allow you to search the settings, but in general go to settings and about phone or status:
Windows
Open the start menu and type cmd in the run box pressing enter to launch the command prompt. Then type ipconfig /all and enter at the prompt. Find the WiFi physical address.
Mac
Open up settings, network, wifi, and sometimes an advanced button:
