If you wish to connect to cPanel over FTP, all you need to do is connect to your cPanel hostname.

For example, if your network's cPanel host is pbn17.priorityprospect.com then you will need to connect using following details:

Host: pbn17.priorityprospect.com
Port: 21
Connection type: Active

Using active connection is very important. If you see an error that looks like "Error: Failed to retrieve directory listing" then this means you are using passive connection. Switching to active connection will fix it.