Associate two already existing objects using Has And Belongs To Many

I'm making an App in Rails to show anime, these animes has and belongs to many languages, so I made a HABTM association:

class Anime < ActiveRecord::Base
  has_and_belongs_to_many :languages
end

class Language < ActiveRecord::Base
  has_and_belongs_to_many :animes
end

Now I don't know how can I make associations between them, I've created many Languages' records to use them, for example, Language with ID 1 is English, Language with ID 2 is Spanish, etc... And I want to just make the associations between an anime and a language, ie, if I want to say that the Anime with ID 1 it's available in Spanish only, then in the table animes_languages I want to create the record with values anime_id: 1 and language_id: 2 and nothing more, but I belive that if I execute the command Anime.find(1).languages.create it will not use an already existing language, it will create a new language, but the only thing I want is to make associations between already existing animes with already existing languages, so, How can I do this? Should I make a model for the table animes_language?

It's confusing for me cause when I created that table as specified here enter link description here, I created the table without ID, it only have the fields anime_id and language_id.