Hello, @TFS,
Actually, for the Currency switcher, you have to first install and configure the WOOCS plugin and for the language the you have to use WPML plugin.
Check the article links of both the plugins to know how to setup these plugins with our theme:
https://xstore.helpscoutdocs.com/article/31-translation-with-wpml
https://xstore.helpscoutdocs.com/article/141-xstore-currency-switcher
Now, to show the switcher on the header top please watch this video for a better reference: https://streamable.com/lkgzrf
Regards 8Themes Team.