if they follow the ERC20 standard, they can be added to MyEtherWallet.
Insure you are using the correct URL, and watch for phishing!
right if the coins are supported by erc20 well myetherwallet is the best and most secured,but must sure that its not the hack site because many had been victimized by those damn hackers..i use MEW for long and so far im contented on their service,and about the support its smooth and no hassleInsure you are using the correct URL, and watch for phishing!