SFTP, the SSH File Transfer Protocol, is used to secure an FTP transfer by passing through an SSH tunnel. Consequently, clients can use a simple graphic interface via the FTP client of their choice.
From Remote access > SSH allow your SSH user password connection permission.
Then from your FTP client, fill-in the SSH connection information. Let us take the example of the test account and the FileZilla FTP client:
This must not be confused with the FTPS protocol: FTP transfer secured by SSL or TLS protocols.