To share the project, you could simply copy the project URL to others in "public" status, and then they could view it on the webpage. To share the design and let others edit, you need to go to the design interface in the Floor Planner, click "FIle(in the top navigation bar) - Share the project - set as public" and then copy the link. When your friend or colleague opens that link, it will duplicate the design under their account and allows them to view and edit the design in the floor planner.