When you create an User, you need to chose the Profil assigned to the User : sadmin, admin, ladmin, (other).
After the creation of the User, on the list, you have a column called Tag : when you click on the link, you can enter the tag you associate to the User.
From the Profil ladmin, you have lot of things in read mode but the User of this Profil could delete hardware ... May be the better is to create a Profil similar to ladmin and modify it as needed ?