In order to add or adjust base floor plans you'll need to click the "Scheduling" button that is in the top navigation bar, then click the "Base Floorplans" tab.
Either create a new base floorplan or click the name of the base floorplan you'd like to edit. Then you'll be presented with a list of departments and shifts residing on them as shown below:
To edit the time of a shift, click and drag the ends of the bars.
You can add new shifts and navigate the floorplan section using the toolbar at the top.
You can also click the center of a shift's bar to edit the shifts properties.