There are two ways to transfer your design to another account: First: Click on the “Share design” button directly in the configurator. Secondly: Open the “Designs” tab in your account and click on the “Share design” button under the relevant design. After opening the link, the other person can save the design in their account and continue editing it independently of you.
https://www.youtube.com/watch?v=gluG-u_ycuA&list=PLqlk7yRn567-YboPHfIZDilNfWa7m9DUM&index=2