FTPS (also known FTP-SSL, and FTP Secure) is an extension to the commonly used File Transfer Protocol (FTP) that adds support for the Transport Layer Security (TLS).
FTPS should not be confused with the SSH File Transfer Protocol (SFTP), a secure file transfer subsystem for the Secure Shell (SSH) protocol with which it is not compatible. It is also different from FTP over SSH, which is the practice of tunneling FTP through an SSH connection..
If you have not already created an FTP user, please follow these instructions: Creating an FTP user
How do I connect with FTP application using FTPS?
Click File > Site Manager.
Enter your credentials from the section above.
Host: exampleserver.rebel.com (Use the server name which you're connected to, for example: canada3.rebel.com. The server name can be found by looking in the URL of your control panel)
Username: The username you created above in Step 3.
Encryption: Require explicit FTP over TLS
Do not click Okay or Continue yet..
Click the Transfer Settings tab.
Set Transfer Mode to Passive.
Click Connect, then enter your password.
The right hand side of your window shows the server. Double click on the directory that contains your website (it's usually your domain name or httpdocs). You can then either drag and drop the files from your desktop into the right hand side of your Filezilla window, or navigate to your files on the left, and then drag them into your server on the right.