Select the option to create a new FTP account. You should then enter the details outlined below:-
Create a FTP Site With Name: homepage.ntlworld.com/user.name
Host Name or IP Address: upload.ntlworld.com
User ID: user.name
Password: Enter the password that you use for email
Click "Save Password" and then "Finish"
If you now click "OK" you will be connected to your web space.