Download a WWW int? Or convert?

I need to convert a text (numbers only) i downloaded with WWW and then convert it to a int. Here is my current code but it is not working: using UnityEngine; using System.Collections;

 public class FetchXP : MonoBehaviour {
 public GUISkin GUISkin;
 public string url = "url";
     IEnumerator  Start (){
         PlayerPrefs.DeleteKey("xp");
         WWWForm form = new WWWForm();
         form.AddField( "username", PlayerPrefs.GetString("Username"));
         WWW download = new WWW( url, form );
         yield return download;
         if((!string.IsNullOrEmpty(download.error))) {
             print( "Error downloading: " + download.error );
         } else {
             Debug.Log(download.text);
             int.Parse(download.text);
             PlayerPrefs.SetInt("xp", download.text);
         }
     }

Errors:

1.(18,37): error CS1502: The best overloaded method match for UnityEngine.PlayerPrefs.SetInt(string, int)' has some invalid arguments 2.(18,37): error CS1503: Argument #2' cannot convert string' expression to type int'