The badge indicates that the forum user participated in a Closed Beta of the Create Your Story tool. We are very grateful to our wonderful closed beta participants who spent several months working with us to bring the Create Your Story tool to life. You can trust these users as a source of knowledge for how the tool works and how to write great stories with it.
New badges will be given in the future for contest winners and other Maybe-sponsored Forum participation. Keep an eye out on the announcements channel for those opportunities.