About selection, have you read the last reply you received: http://forum.audacityteam.org/viewtopic.php?f=62&t=95470
You run effects from the Effect menu, not from Preferences. However you can't remove random noises like a whisper or a bang with the Noise Reduction effect - that is only for steady noise like a hiss. Random noises may need dealing with individually according to what they are.
How are you recording voice and keyboard? Both at the same time with a microphone? Can you attach an audio sample of the noises you want to remove? Please see How to post an audio sample
Generally I suggest you do yourself a favour and make sure you have the current Audacity 2.1.3 release from http://www.audacityteam.org/download/windows
Then our documentation http://manual.audacityteam.org/
will match with the version of Audacity you are using.
desertvibrations wrote:I am a newbie and recording voice and keyboard...I checked help and couldn't quite figure out how to sole problem. Audacity said to go to go to preferences and I believe effects and I was lost at that point. Also don't quite understand how to mark the area in the beginning before the music and vocal begin?