Modify Custom CreateUser method in membership

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ASP.NET

MVC

I want to modify this custom method to have additional fiels like LastName,Email and Isapproved.
Here is my complete code for user registration

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Security;
using MVCLogin.Models;




namespace Recaptcha
{
   namespace MVCLogin.Controllers
        {
            public class AccountsController : Controller
            {
                //
                // GET: /Accounts/

                public ActionResult Index()
                {
                    return View();
                }

               [HttpGet]
                public ActionResult Login()
                {
                    return View();
                }
               [HttpPost]
                public ActionResult Login()
                 {
                    return View();
                }
                [HttpGet]
                public ActionResult Registeration()
                {
                   if  (!WebSecurity.Initialized)
                    {
                       WebSecurity.InitializeDatabaseConnection("MVCLoginConStr",
                       "Authentication", "UserId", "FirstName", autoCreateTables: true);
                    }
                    return View();
                }

                [HttpPost, RecaptchaControlMvc.CaptchaValidatorAttribute]
                public ActionResult Register(Registration model, bool captchaValid)
                  {
                    if (!captchaValid)
                     {
                 ModelState.AddModelError("", "You did not type the verification           
                 word correctly. Please try again.");
                     } //if
                     else
                    {
                        if (ModelState.IsValid)
                        {
                            // Attempt to register the user
                          MembershipCreateStatus createStatus;
                          Membership.CreateUser(model.FirstName,model.Password,
                        model.Email, null, null, true,null,out createStatus);
                        if (createStatus == MembershipCreateStatus.Success)
                            {
                                FormsAuthentication.SetAuthCookie(model.FirstName, false);
                                return RedirectToAction("Index", "Home");
                            }//if
                            else
                            {
                        ModelState.AddModelError(string.Empty, "Your error Message");
                              }//else
                        }//if
                    } //if   
                    // If we got this far, something failed, redisplay form
                    return View(model);
                } //register
                  public ActionResult Confirmation()
                  {
                    return View();
                  }
          }
     }
 }

Thanks in advance for help..