Can you tell me what coins myetherwallet supports? I have an account there but i saw there is only ETH.
MyEtherWallet supports everything that Ethereum network supports. On your MEW address you can hold Ether coins (ETH) and all ERC-20 tokens (like EOS, OMG, PPT, QASH and many others). You don't have an 'account' there. MyEtherWallet is a client side wallet for ETH and ERC20 tokens so not really an online wallet. It's just an interface between the blockchain and your computer.