I probably should extend the FAQ with help I am blocked but this is included in the FAQ right now:
I select "Block users from the backend of your site option and ban my own country and nothing happens
This is "as-designed" as long as you are logged in you will not be blocked. Open another browser and see if you can login to your backend. By designing it this way you can fix a whoops without you having to alter your database.
As answered on my own site you need access to the database to resolve this:
You can only fix this by going in to the database administrator. Most hosting providers have phpmyadmin installed.
You should be able to login there with probably your database account. Then go to the wp_options table and remove the line that says 'blockcountry_banlist'
If you need further help just reply!