Unfortunately, changing your default profile currency is impossible due to technical reasons.
However, if your profile is relatively new, don't hesitate to get in touch with our customer support - we might consider offering you to create a new account with the currency you need. Such requests are evaluated individually by the management.
Please note that creating additional accounts is forbidden by our Terms & Conditions, therefore we kindly ask you not to create such accounts without permission, or your accounts may be closed.