Your wallet's ETH balance (0.008 ETH) is not enough to cover the gas cost (Ethereum network fee). EtherDelta sends 38 ETH with each transaction. This is an overestimate and the excess will get refunded to you. It's a good idea to send more than 38 so you can pay for not only this transaction, but also future transactions you do on EtherDelta. The gas has to come directly from your Wallet (EtherDelta has no physical way of paying gas from your deposited ETH).
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