It helps us to help you if you give more informative detail on what you are wanting to do, eg what is the purpose of putting the 'project' online, as back up, sharing with other users of Music Maker, for people to listen to or what?
JOHNEBAKER HEY I want to back up my projects and transfer them to another computer. Can you tell me which folders and files I should select when transferring?
Assuming the second computer installation is identical, including effects, soundpools and VST instruments and no external audio files are used, then you only need to copy the project file, .MMM, to the second computer.
Otherwise use the File, Backup, Save project and used media option to save the project in a folder specified by you. Copy this folder to the 2nd computer via USB memoery stick.