You shouldn't really alter other peoples projects. And making a single player game, two or more players would probably break some design decisions by the creator. But enough chiding. To answer your innocent question about adding scripts to a project. That's quite easy. First you need access to the *.rxproj file. Not sure anything after this will be helpful if the project is encrypted but anyway. Open the *.rxproj file. Hit F11 to open the script editor window. Insert an empty line in the script list right above 'Main' on the left. Copy the text from the script you want to add and paste it in the right side with the empty slot you just inserted selected. Now before you leave the script editor window. Name the script. Hopefully it will be something understandable. Now hit apply/ok and leave it. The script has been added with no complications... in a perfect world.
Good luck with it! :thumb: