I have the same problem. Any solution?
you must always save youre private key
so you can use youre addres anywhere, not only use in myetherwallet.com
is good if login in myetherwallet use private key
How if he can't save the private key because he can't control it or i mean the site doesn't want give the private key to their user?
From OP we know if all of them don't use MEW but other ethereum wallet, which seems unfamiliar for us