You can't add new entries to the TV-section just yet.

The one you were looking to add is already here: http://www.themoviedb.org/tv/1430-cosmos-a-personal-voyage

how can i help for to edit information in series, movies or pictures? I really want to help but i dont know how!!

All information you need is here: https://www.themoviedb.org/bible

Can you add this please? https://en.m.wikipedia.org/wiki/Cosmos:_Possible_Worlds

@ragua said:

Can you add this please? https://en.m.wikipedia.org/wiki/Cosmos:_Possible_Worlds

It's better to create a new topic rather than use a different topic for your own question. It's added here: https://www.themoviedb.org/tv/58474-cosmos/season/2