Saveset buttons, and also report views, are how to get Cognos to remember selections when you return in a later session, days later perhaps. Neither is necessary if you merely want to rerun something you just ran, changing perhaps just one thing. You don't have to reenter the same values into all of the other prompts again. Use the button that looks like a sideways triangle "play" button. In Cognos 10.x it is blue and says "run" or "run report" when you hover over it. In Cognos 11.x it is either 1.) brown or black and says "run as" when you hover over it, or 2.) adjacent to the "run as" button and says "refresh" when you hover over it.