When you install the People Power game it creates two folders on your computer. One is for Scenarios you create or download from other users; the other is for Games which you save. On a PC (Windows) system, these Scenario files are in C:\Users\<username>\Documents\PeoplePower\Scenarios.
On a Mac, <computer>/Documents/People Power/Scenarios.
Scenario files which you create are automatically placed in the Scenarios folder in Documents. They can only be deleted from this folder. They can’t be deleted from within the Scenario Builder. However, if you are working in the Scenario Builder and want to quit without saving the scenario you’ve been building, you can simply quit the Scenario Builder—you’ll be asked whether you want to save; click No.
More information about Game and Scenario Files and their locations is in the Help Menu, accessible within the game.