First you have to install program, called 'Cain and Abel'. Then, you will be automatically asked to install 'Win Pcap' and you should do that. After installation you have to click on 'Cain and Abel' program icon with right mouse button and start it as administrator. Then push blue plus sign to scan Mac addresses. After scanning go to the bottom of program window and press APR tab. Then push blue plus icon again. When table appears push first option in first square and first option in second and then OK. To reload you only need to push the third button at the top of program window.