The main purpose of the plugin: translation of pages and posts on your site by ajax.
Download plugin archive in zip or gzipped tar format and extract the files on your computer.
Create a new directory named
mealingua in the
directory of your WordPress installation. Use an FTP or SFTP client to
upload the contents of your mealingua archive to the new directory
that you just created on your web host.
Log in to the WordPress http://your_site/wp-admin/plugins.php and activate the mealingua plugin.
Configure the plugin and add it to the plugin settings page (versions later than 2.0.0).
Download any flags you need from web for free or buy if you want cool images.