You’ll find these pages under the Users section of Looker’s Admin menu. Choose one for more information:

• Users
  Add, edit, remove, and impersonate (sudo) Looker user accounts.
• Groups
  View, add, edit, and delete Looker user groups.
• Roles
  Create and edit model and permission sets to define Looker roles.
• Content Access
  Manage user access to spaces and content in spaces.
• User Attributes
  Create and assign custom data to user accounts, and see uses for custom data.