1) Please read this topic – https://www.8theme.com/topic/no-choice-of-currency-and-language-as-in-the-demo/
“Order online or call us (+1800) 000 8808” text can be changed in Appearance > Widgets > Left side top bar area.
https://youtu.be/4SfPPuwPCVI
2) WooCommerce > Settings > Account > enable registration on My Account page
https://docs.woocommerce.com/document/configuring-woocommerce-settings/#section-15
3) You can maybe find a plugin that can provide this functionality. The theme has no such features implemented.
https://xstore.helpscoutdocs.com/article/87-facebook-login
4) http://prntscr.com/omg2f8
Regards