I am using plink to connect to my server. To visit my remote server, I only need to use

C-x C-f /plink:SESSNAME:/path/to/your/file/on/server/

Below is a screenshot of how to open a remote file/folder.

The Tricky Part

The tricky part is that, when using plink, the second field is session name saved on PuTTy (see here). Therefore, one need to open PuTTy and save a session there. I was thinking that I set a hostname at .ssh/config and it would work. But of course it wouldn't.