Im not quite sure I understand your post 100%, (English is not my native language)but the only thing you need to do in steemit.com is to keep your password safe, there is nothing else to worry about. I posted the above link so that people know that nothing is lost if you don't copy all your private keys in your first log in as the OP states. If you ever need your private keys the instructions in the above link will help you retrieve them, in the feature there might be an easier way I guess.