List of environments (project menu -> environments) gives quick overview of available environments in the project.
Environment details page gives quick overview of environment – its name, manager, state, phase and depoloyed version. Having a release manager role, you can change environment's name, manager and deployed version. It is also possible to deploy a new version into test or production environment from version details view.
You can add new environment from environments list page using link “New environment”. To add a new environment, release manager role is needed.