Got to the Contentful App Marketplace (link above) and click 'Get the app'
Select the Contentful space and environment in which you want to install Arboretum App.
Authorize access of the Arboretum App in your space.
Follow the steps as shown in the video above.
Arboretum App is a Contentful app that you can install in your environment. It's a visual representation of the sitemap computed by the Arboretum SDK.