Press Settings
Press Edit
To add a new currency
Input a 3 letter currency code in the Currency field
Input the exchange rate against 1 Euro in the Rate field
Use the Description field to write a description
Press Add
Repeat the procedure if you want to add more currencies
To remove an existing currency
Find the currency you wish to remove by selecting in the scroll list
Press Remove
Repeat the procedure if you want to remove more currencies
To add a new currency
Find the currency you wish to edit by selecting in the scroll lis
Edit the exchange rate against 1 Euro in the Rate field
Edit the description in the Description field
Press Modify
Repeat the procedure if you want to edit other currencies
NOTE: Custom currencies will not receive the exchange rate update from the Internet, so you have to adjust the rates manually for custom currencies. Also you can not remove or edit the Euro, as that is the base currency.