ASP.NET Identity customize with own database

I already have my database ready with the login table, and I did not want to change it, so I would like to know if I can customize it with the tables I already have! and how to do it!

Below the mapping of the login table in my database:

public partial class cnet_logon
{
    public long id_pessoa { get; set; }
    public long id_pessoaContato { get; set; }
    public string userpassword { get; set; }
    public bool ativoAcesso { get; set; }
    public bool ativoConsumo { get; set; }
    public virtual ncl_pessoa ncl_pessoa { get; set; }
    public virtual ncl_pessoaContato ncl_pessoaContato { get; set; }
}