click on menu (on mobile context) below site logo you have country flags (plugin is visible when you have activated more than on language on your site)

How do I activate more than 1 language

Do i need to purchase the language pack. If so could you kindly tell me which plugin to buy.

Done it Thank you.

I now have English & Russian. Any other languages available. Please help 

This is what happened after adding Russian. Can someone help

you must translate strings on panel admin -> settings -> language

OK Thank you very much. I understand now.