If the person is not yet a member of your organization, you can grant them administrative access directly during the invitation process by enabling the Admin option in the pop-up menu before clicking Invite.

If the user is already an active member of your organization, an administrator can elevate their account permissions by following these steps:

• Log in to KOS Studio.
• Select Settings from the top navigation bar and choose User Management.
• In the User Management window, select Users from the left sidebar.
• Click the Edit icon for the user who needs the role update.
• The Edit User Information modal will appear; enable the Admin option.
• Select Update to save the changes.

You can learn more here: User Management