The cryptotrader can only work with USD in your Bitstamp account. If you have Euro’s in your Bitstamp account you must first convert it to USD. This is simple and works as follows:
1 – Login at bitstamp.net
2 – Choose market EUR/USD top-left on the page
3 – Go to Buy / Sell (top-right on the page) -> Instant Order (simple) -> Choose Sell EUR.
4 – Enter the number of Euros you want to convert to USD. Then click the SELL EUR button.
5 – Normally within one minute your Euros would have to be converted into USD at the current market price.