>I am using active reports and I would like to know how I can set my report so that at run time the end user can modify the report to his convience.

Since reports are compiled in your application or component, you can allow users to directly modify the reports (just as they can do with Crystal Reports or Access Reports).

But you can modify some (not to say all) properties of the report at run-time. This said, it is to you to give the users a screen that will allow them to modify these properties!