You better check your URL before puting your private keys, because there are lots of pishing sites that are running around trying to steal your coins.There are many ways to know if your in a pishing it is when, the url appears a wrong spelling of etherdelta or etherwallet at your URL and also if they're asking you to retype or re enter your private key. To avoid these, just make sure that you are in the right sight and don't forget to bookmark it.