You can select a location or multiple locations.
On a Computer
To select consectutive locations, click the first location you want then,
while holding the shift key, click the last location you want.
To select non-conseccutive locations, hold the "Ctrl" key while clicking
each location.
After selecting locations, tap the "Save Changes" button.
You can use both methods at the same time.
On a Mobile Device
Tap the box to the left. The data picker will open at the bottom of the screen.
Tap each location that want to search for. Tap again to de-select a location. Tap
Done when your finished.
After selecting locations, tap the "Save Changes" button.