As of version 1.4, reports are no longer housed under the Roadmap view. They can be found under Reporting.
The Roadmap provides a easy way to work on a particular milestone and see progress at a glance:
Completed issues can be shown/hidden by using the “Toggle Completed” button. By default all issues are shown but this can be changed in the settings. Completed issues are displayed in a greyed out state to make it easy to see that they are not your main focus.
The drop down menu houses all your milestones. Changing the selection automatically updates the list view to show the issues attached to that milestone.
To view any of the issues, simply double click and they will open in the Viewer Editor.