Rails twitter gem initialize

Rails twitter gem initialize

I've installed the twitter gem :https://github.com/sferik/twitter to my
site, I've added an application to my twitter account and I'm ready to set
it up, I'm just not sure where to put the following:
Twitter.configure do |config|
config.consumer_key = YOUR_CONSUMER_KEY
config.consumer_secret = YOUR_CONSUMER_SECRET
config.oauth_token = YOUR_OAUTH_TOKEN
config.oauth_token_secret = YOUR_OAUTH_TOKEN_SECRET
end