You can select badges for a specific shift by clicking the shift bar within a floorplan. You can get to the floorplans by visiting the "Scheduling" button in the top navigation bar, then either clicking on a week in the left menu under "build schedule". You can then click "Manage Floorplan".
Alternatively, you can edit the base floorplans using the "Base Floorplans" button in the top navigation.
Find the shift you want to modify within a floorplan, and click the colored shift bar to add or edit the badge assigned.