how to sign in as root?

Hello, I couldn't find more relevant section for my question I hope it makes sense to ask here, on this space. I need to sign in as root, in WinSCP FTP client. How can I do it?
Thanks in advance.

You have asked this already:
https://winscp.net/forum/viewtopic.php?t=31368
This Super User question also looks suspiciously similar:
https://superuser.com/q/1675771/213663