At the moment, you can fund your account balance in USD only.
Go to Dashboard > Spend Cards.
Click Add Funds (top-right of the page).
A panel will open showing your unique virtual account and banking details, including:
Account holder name
Account number
Bank name
SWIFT/BIC code
Account currency
Copy these details and initiate a bank transfer from your bank.
Support for additional balance currencies will be added in the future.