C# How to send a string to my FTP server.

1. RPG rpg = myPlayer.GetComponent<RPG>();
2. WWWForm form =newWWWForm();
3. // The name of the player submitting the scores
4. form.AddField("Username", rpg.username );
5. // The score
6. form.AddField("MaxHealth", rpg.maxHealthPoints.ToString());
7. // Create a download object
8. WWW download =new WWW(WhatDoIPutHere, form );
9. while(!download.isDone){
10. print(download.progress.ToString());
11. }
12. if(download.error!=null){
13. Debug.Log(download.error);
14. }
15. print(download.isDone);
16. print("Uploaded");

I have that in a void. What do I put instead of 'WhatDoIPutHere'? I have an FTP server which I can log into in Filezilla. Could someone tell me the format that I input the data from Filezilla into the string? Thanks in advance for all you advanced programmers,
Connor.
CEO of Radioactive Technologies.