Opencart How to change Default Currency from USD to other currency?

「Long龙儿Er小编の話Prologue」The logic of changing default currency is 1. Add new currency, 2. Set it as default.

Q. How to add new currency in opencart?
Q. How to change default currency to Singapore Dollar in opencart?
Q. How change default currency from USD to SGD?

Step 1. Admin -> System -> Localisation -> Currencies

Click "+" button at right top corner to add our wanted currency. Fill in all info and save.



The system doesn't seem smart enough to auto set we newly added currency as default although we set 1 in value. Hence,

Step 2. Admin -> System -> Settings -> Store edit -> Local -> Currency
Choose the auto update currency if needed as the default exchange rate must set manually.