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Keep your "Expertise" level as "Novice" unless you know what you are doing.

The entry "Actual group" lets you join a group with which you will share the same challenge template.

If you are an instructor or expert challenge organizer, you can share a challenge you organized as a template. WARNING: do not do that while you are running a challenge because this will make available your whole competition bundle with private information to the outside world. When you are ready to share your challenge, change your expertise level to "Familiar" or "Expert". A new tab "Groups" will appear. This will allow you to share your challenge as a template to a group of people of your choice.