How do I find the MAC address?

There are two scenario's: 

a) MAC address for a wired connection with the modem/router
b) MAC address for a wireless connection with the modem/router

a) MAC address for a wired connection

If you have a wired connection with the router, you can click on Clone MAC address to automatically copy the address of the wired network card. 

b) MAC address for a wireless connection

Carry out the following steps:  

1. Simultaneously press the Windows key and the R key. 
2. Type cmd in the Run menu and press Enter or OK.