You can change the initial plan settings at any time by using the Plan Setup of the EasyPlan Wizard. Details depend on the version of the software and the selections you have made.
In the 4.0 versions of the software, you can access the Plan Setup by clicking the File menu and choosing Plan Wizard.
In Marketing Plan Pro, you can access this Wizard by clicking on the View menu and checking the Plan Wizard item. Once you're in Wizard Task mode, you can then scroll to the top of the list and expand Plan Setup, which will allow you to adjust any of these items.