To transfer files from your computer to twinkle or the other way around, you can use two types of software:
1. SFTP Net Drive (for Windows only) ⇒ mounts remote file systems as Windows drives via SFTP. Once connected, you can browse,
edit, copy/paste files as if they were stored on your local machine.
        2.  FileZilla ⇒ opensource FTP/SFTP client for Mac, Windows and Linux. To connect to twinkle: 
      Host: sftp://twinkle.bms.cityu.edu.hk Input username and password Port: 17 
If you cannot connect with server, try this, maybe useful:
File ⇒ Site Manager ⇒ SFTP-SSH File Transfer protocol
Host: twinkle.bms.cityu.edu.hk
Leave the port blank
User: colliculus
