Understanding Public and Private "Build-Your-Own" Competitions
When creating a "Build-Your-Own" competition, you can choose between making it public or private.
Public competitions are open to anyone, while private competitions require an private code to register.
As a competition creator, you will have to provide users with you competition's "private code" which they will have to enter in order to register.
Check out how the following article for more details on how to share your competition and private code: How can I view and share my created competition?
Regardless of the type, all competitions will be visible to users in the "Build-Your-Own" tab.