If you update your store domain, or if it's not detected when you first activate your account, you can ask the app to refresh your account information. This is required for the feature to work as the app detects the visitor's domain to make the interactions work.
The Quota warning field sets the level of quota usage before a warning email is dispatched to you. In this case you can purchase more credits, if necessary.
Activating the App
Clicking the top button activates the system. This installs a single, easily removable, script into your theme.liquid file.
If your theme doesn't explicitly include jQuery, or if the App doesn't seem to be functioning, you can click to install jQuery script into your theme.
If you look in your theme file. You can see the changes the App made. This is the extent of the changes required by Advanced Store Localization.