Turn on the SSH server on your Raspberry Pi
See Step 2 in post http://www.anthonybeckett.com/web-development/using-ssh-interact-raspberry-pi/
Install Filezilla FTP from https://filezilla-project.org/download.php
Open Filezilla and open the Site Manager
> New > Site Manager
Enter your raspberry pi’s SFTP details
4.1 – Click New site and enter your raspberry pi ip address as the host.
4.2 – Leave the port blank (to use the default).
4.3 – Select the protocol “SFTP – SSH File Transfer Protocol”.
4.4 – Select logon type as “normal”.
4.5 – Enter your raspberry pi username pi.
4.6 – Enter your pi user password.
Click connect to save your changes and connect to your raspberry by by SFTP/SSH.
You should now see you raspberry pi’s root directory in the remote site window