First, in your project, you need to install Capistrano 3 for Rails. You can find the official documentation here.

So your Gemfile should have content along these lines somewhere:

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group :development do
  gem 'capistrano', '~> 3.10', require: false
  gem 'capistrano-rails', '~> 1.3', require: false
end

You should already have the bundler Gem installed, so you can install all necessary Gems for your Project by simply executing bundle.

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$ bundle

After this you will have Capistrano 3 installed and can now use it to set up the deployment tasks for the staging and production environment your Project:

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$ bundle exec cap install STAGES=staging,production