Currently there is no option to switch currencies in your Admin panel once the account is created.
Should you need a different currency on your account, please follow these steps:
1) Create a new account here.
2) Select EURO or USD in the registration form.
NOTE: Advertising Accounts within the EU are subject to 21% VAT when funds are added. Unless you work or live outside of Spain and you have a [valid VAT number] that has been verified by our Compliance Team.
DO NOT add funds if your VAT details are showing as "Pending". Instead contact our Compliance Team here and select the reason "VAT Verification".