To change the base currency and to set exchange rates, open Converter
.
Select Type > Currency > Options > Currency rates.
The rate of the base currency is always 1. The base currency determines the conversion rates of other currencies.
To change the base currency, select the desired currency and Options > Set as base currency.
When you change the base currency, all exchange rates are reset to 1.
To set new exchange rates, select the other currencies, and enter the number of units that equal one unit of the base currency.
To add decimals, press #.
To save your changes, select Done.