In the Users and Groups application it is possible to manage users, groups and their permissions. The following options will allow users certain actions on their own accounts.
If enabled, it is possible to delete user accounts in the upper right menu of the Users and Groups application. Otherwise it is only possible to deactivate it.
If enabled, the user can deactivate its account in the "Edit my data" entry of the upper right user menu.
If enabled, the user can delete its account in the "Edit my data" entry of the upper right user menu.