The Nuxeo Jenkins Report addon requires no specific installation steps. It can be installed like any other package from the Marketplace or from the Admin Center.
After you installed the package, a new document type is available for creation in workspaces and reports: the Jenkins Reports Container.
Since this addon enables users to send the report from the Nuxeo Platform, your Nuxeo server must be able to reach an e-mail server. This is the same configuration that the one required for the email alerts to work. See how to enable e-mail alerts.