While in the District Map view you can also use the touch align tool to modify existing sales districts or create new ones.
Once you've opened up the new tab from step 1, make sure that you have Maps selected (1). Then click on Map showing the districts (2)
Select the Touch Align Tool (1) from the home menu toolbar. If you want to view territory layers on the District Map View make sure to toggle them on in the Configure layers tool.
Next, zoom into the area you would like to create a district in. In this example we will create a district in the Northwest of the US.
Click anywhere on the map with the left mouse button (1)
While holding down the left mouse button start to select the areas you want to add to this new district (2).
When you let go of the left button you will have created a new district.
You can also use this touch align tool to modify existing sales districts.