I'm not sure if I phrased that right, so perhaps my specific case will explain for me. I have buttons for "fave"-ing and marking-as-solved on puzzles in my blog. The users that know the features exist love tracking what they have or haven't solved yet, but I routinely get visitors that had no idea the features were there. The buttons are faded to show their disabled status, but I think that may be contributing to missing those features.
What can I do to make those features more prominent while still showing that they are disabled unless you're logged in?
One of the pages: http://thegriddle.net/719