No, a new account is not required in order to use other currencies, this function is available on the main account.
The default currency is EUR. All other available currencies are seen in your account, you can check those following these steps:
Personal Web Panel
Incoming payments:
Log in to you account
On left panel click "Accounts"
Choose "Banking details"
Choose desired account
Down below you will see available currencies
Outgoing payments:
Log in to you account
On left panel click "Currency exchange"
You will see currencies available to buy, and those will be available for outgoing payments once exchanged
Mobile App
Open your app
Swipe left to see available currencies for both incoming and outgoing payments
Other currencies are only available under certain conditions.