The following are the six different roles that a member can have on a Card, Each role has all of the permissions of the lower roles below:
The original 'star', or creator of a card. This cannot be changed.
Assign all user roles, and promote/demote moderators
Cannot be demoted
The reviewer and curator of the Members and child Cards.
Change the Default Joining Role and Default Role in Parent
Cut child cards
Promote/demote members (except Moderators)
Edit the card content
Manage comments (incl. deleting other users)
Shared Tag management
Publishing new child cards within this parent card
Cutting cards they added within this parent card
Personal tag management
Adding this card to another parent
Adding a child card as unlisted (not publishing)
Delete for Me
You will notice that 'Viewing the Share code' is omitted from this list of permissions. This is because it depends on what the default role of a card is. If a member of a card has a role lower than the default role, they are unable to view the Share Code. If an Author/Moderator demotes a member to lower than the default role, the share code is automatically reset - to prevent the demoted user from rejoining at a higher role.