Hi Jacques,
You are welcome.
Please don't worry about *any* question ever being stupid -- Project has a
fairly steep learning curve
You can tell if a task has constraints by looking at the Indicator column
(marked with the blue "i") in the Task Sheet (left side of the Gantt Chart
view.) If you typed Start or Finish dates for your tasks, chances are the
tasks are constrained and you will need to use the Adjust Dates button on
the Analysis Toolbar.
The schedule of the tasks should be driven by predecessor and successor
relationships (links).
You may find it helpful to take a look at Mike Glen's series of articles on
Project at:
http://pubs.logicalexpressions.com/Pub0009/LPMFrame.asp?CMD=ArticleSearch&AUTH=23
Mike does a great job stepping you through setting up a project from the
very beginning.
I hope this helps. Please post back with any further questions.
Julie