i have os x 10.8.5 montain lion in dvd how can reinstall on my mac

hello apple users i am see a vedio on you tube about macbook pro

i see how can factory reset my mac.after the erase all data from my mac appear re install os x 10.8 mountain lion

then i klic reinstall mac need apple id i put my id then apear this aplication temprari un available

then i get a dvd os x 10.8.5

know how can reinstall from dvd

please tell me thank you