Hi @dsdotca,
The plugin will block all access from countries outside of your whitelist. For example, if you were to whitelist Canada, only IP addresses from within Canada would be able to access the login page for your site.
If you find that you are unable to log in due to being in a different country which has not been whitelisted, you can remove the block by deactivating the plugin. Since you would be unable to access your WordPress dashboard, this would need to be done via your web hosting – https://www.ostraining.com/blog/wordpress/disable-a-wordpress-plugin/
We may also add an override option to the plugin in a future release, if people feel it would be useful. This would allow you to circumvent the block if you went to a secret url of your choice, allowing you to log in from outside of your whitelisted countries.