Current multi languages and currencies dropdowns are static html to show demo.
To work that, you need to install third party plugins.
For the multi-language, please install "WPML" plugin.
And for the multi-currencies, please install "WOOCS - WooCommerce Currency Switcher" plugin.
After install these plugins and set your languages and currencies.
Then, current static language & currency dropdown will be replaced with your languages and currencies.
If you have the other problems, please let us know again.
Best Regards, C-Themes