I AM MAKING A GANTT CHART IN MS PROJECT.I CANNOT CHANGE THE START AND FINISH DATEs...IT IS SOMEHOW BLOCKED TO USE THE DROP DOWN MENU . THE TASK TYPE SAYS IT IS A "FIXED DURATION"...i CANNOT CHANGE THAT EITHER.

I would go to the Help file, and search on changing duration. http://office.microsoft.com/en-us/project/HA101130691033.aspx