I am absolutely new in WP, and have not any knowledge about programming.
I hope somebody will help me :)
I didn't know where and how tu paste shortcode from plugin, so I used a google translate script (last step of its configuration on my google account), and paste it at the beginning of each page or post.
But maybe it is possible to make only one dropdown list with this plugin. The best will be in top menu bar, between "contact" and "search".