How do I add the location from which I want to monitor my keywords?

On your keyword source page, use the Select Locales bar

1. Go to your desired keyword source page: just click the Projects tab in the top navigation bar, click on the Settings Cog next your project's name or click the Manage Keywords button, then select your desired keyword source.
2. Scroll down until you see the Locales section.
3. Type your desired location into the Select Locales search bar or click the Browse All button to add your desired location.

The United States is the default location, but you can remove it when you select your locations.

Always click Save Keywords after you make any changes in the Keyword Manager.