I have only one question, Do i need to buy battle for azeroth to play with demon hunters? I look in the forums for help, https://us.battle.net/forums/en/wow/topic/20767718860, and it said i need subscription and a charater above lvl 70, i have subscription and 79 death knight. Why can´t i create a demon Hunter? Sry if this question sound stupid, and it is easy to found the answer, myself could not find it.
no you should only need legion, which is rolled into the base game now, and just require a subscription. Have you tried logging into your DK then going back to the character screen to make one?
Are you trying to create them on the same server as your 79 DK? IIRC the level requirements are realm/server based not account wide.