i played iw5 with a friend on discord and i want to play with another friend and dont know how to send discord invites to waw lobby

im trying to help my friend download plutonium and make an account but when he type's everything in and does the captcha it doesnt let him create an account would anyone know why

what are the minimun required specs to play the mw3 i play on a laptop and i would like to know any info is appreciated