modifying indicators

I have just started looking at modifying the settings on some of the indicators I use. Depending on what I am looking at. For example: have a second bollinger at 1st standard deviation, or trying different settings for macd or stochastics.
But the truth is I am not really sure that I know what I am doing. Can anyone recommend a source that explains the indicators beyond the basics, so I can learn to make adjustments to the defaults which might yield improved results. Thanks
 
s1461k.png

:cool:

http://www.youtube.com/watch?v=Kl1rRxG251s
 
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