Tansparently capture geographic information anytime a new user registers on your site.
Automatic installation is the easiest option as WordPress handles everything and you don't even need to leave your web browser. To do an automatic install, log in to your WordPress admin area, navigate to the Plugins menu and click Add New.
In the search field type 'GeoReg' and click 'Search Plugins'. After you've found it, click the 'Install Now' link.