How do I view /change settings for different Locations in my account?

On the website:

Click Settings and then Locations
A list appears, showing all of the premises (homes, businesses, etc.) and their control panels associated with your Remote Services account.
The Location at the top of the list is your default location. Whenever you launch the Remote Services app or log in at the website, this location and its system will be displayed first.

For any Location displaying , click the icon to synchronize data between Remote Services and the system control panel.
To change settings like time zone and temperature units (F/C), mouse-hover over the Location's row in the list, and click Edit.
You can use the Search field near the top of the page to look for locations in the account.
See the FAQs about Manage Locations, Location Settings and My Access for more information.

The dropdown list (outlined in red above) gives quick access for starting a sync operation.

Only the first few locations/systems in the account appear in this list
Click the button to sync data with a system that is currently not synced.
Click View all locations to dismiss the dropdown and return focus to the main list