Proxy FTF Read Access Only

When trying to ftp://nstartonline.com
I got this error:

The folder ftp://nstartonline.com is read-only because the proxy server is not set up to all full access.
To move, paste, rename, or delete files, you must use a different proxy. For more info on changing your proxy, contact your administrator.

How do change the proxy server to allow users to have access read and write and/or full access.
Need your expertise,

Thanks,
Galileoave