To set exchange rate for different currencies:
- Settings > Exchange Rates> Add Exchange rate(s)
- Select target currency > Enter rate and save exchange rate
To set base currency or default language or show multiple languages on frontend:
Go to Setting > Channels > Edit Channel
- Go to currencies and Locales section
- Select all locales which you want to show on frontend
- Set default language to show on website
- Choose all currencies you want to show in frontend(Ctrl + Select)
- Set default currency
- Save Channel