How to use UserManager in my controller?

private  SignInManager<IdentityUser> _signInManager;
private  UserManager<IdentityUser> _userManager;

public UtilizadoresController(ApplicationDbContext context, SignInManager<IdentityUser> signInManager, UserManager<IdentityUser> userManager)
{
    _context = context;
    _signInManager = signInManager;
    _userManager = userManager;
}