1. Is it possible to fill the latitude and longitude fields for locations automatically?
Yes, if you click the 'Auto-fill Geo Data" button then this information will be automatically populated for you.

2. How do I access the extension on my website after installation?
In the settings you can specify a path to use for your Store Locator. In most cases this is setup as www.yourstore.com/dealers. Once you have specified your path you can add a link to the Store Locator in your header and footer.

3. Why the map doesn't show all the locations?
If the pagination is enabled, only part of the stores will be displayed (depending on settings which set in the admin panel).