This will show you how to set up FTP-SSL in Filezilla. FTPS uses an SSL connection (making it encrypted).
1) Select the File menu, and click on Site Manager
2) Click on New Site
3) Enter the FTP Host, Port, User and Password as normal
4) for encryption, rather than "use plain FTP", the option "Require explicit FTP over TLS" should be selected. When prompted, accept the SSL certificate.
5) Click Ok.