I'm not exactly sure how your project works or what your trying to do. Do you want to make something similar to Demonoire's dialogue? Just copy their programming and swap the 'yes' or 'no' text for 'next' or 'back' text, and then just change what happens when you select a text.
You can share a project by going to: Menu -> Project -> Save as -> Download a copy. Then put it in Dropbox or Google Drive. You must remember to share it and click 'create link,' then copy that link and paste it in post. Hopefully that makes sense.