npm install. If you want to check out the power of Ember's addon ecosystem you can visit Ember Observer which is made by Code All Day.
The design of empress-blog is a direct result of the work done to upgrade the Ember Guides into an Ember application. This system is specifically designed to make it easy for you to get started and if you have followed the instructions on the README you will know exactly how easy it is. If you are familiar with Ember you are probably used to the Zero Config experience of setting up new applications and adding addons 🎉