i just bought yesterday my apple tv, but i cant install. Im very mad. everything seens so difficult.

i have allready connect in my network. i go in a home sharing setup. i put my apple id, so after they ask for my password, i do, but after the message say something wrong with my id or pasword. But i maked sure that my id and passwork is ok. i reset my password. But nothing is working. please can you help me please.