If you need multiple people to help administer your contest for tasks such as moderation, user management, theme updates, etc. then you need to create additional users and assign them to the Admin group.

Go to the “Users & Groups” menu item.

Select the “Add New User” button.
Add the user details and select “Create user”.

Select the permissions tab for the user details area.

Select the “Select a group” drop down box and add the “Admin” group to the created user.
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The user can then login using the credentials created and access the administration dashboard at https://<contest url>/admin