A bicycle Front Derailleur is used to shift the chains either up to a bigger chain wheel or down to a smaller chain wheel. Adjusting a derailleur can be tricky if you don't have any idea how to do it. It causes a lot of headache to adjust it on our own without expert help.
What does the high and low screw means etc. You can read the explanation it in these websites:
http://www.sheldonbrown.com/derailer-adjustment.html
http://bicycletutor.com/adjust-front-derailer/
http://www.howtofixbikes.ca/2006/12/how-to-adjust-front-derailleur.html
Or you can just watch a couple of videos made by the experts on youtube:
http://www.youtube.com/watch?v=ngm6dr-1na0
http://www.youtube.com/watch?v=gUbGTSm1iic&feature=related
http://www.youtube.com/watch?v=1tQxJqGVznM&feature=related
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