Ruby on Rails: Lesson, Saving Data

How do I do this?:

Create a new Rails app named MessengerApp using
the rails new command.

Then it says:

Install the gems in Gemfile.

How do I do that? Please answer soon. Thank you!!!

@albertmark GEmfile is where all software packages are stored. Bundle stands for that packages it is basically in different words telling you install packages(bundle)

so you just say

bundle install