There is a difference between SecureFTP (fire transfer based on SSH) and FTPS (Encrypted FTP)!
You could do both with total commander.
If you are sure you need SFTP and If you have SFTP plugin installed and you know the connection details do the following
1. In total commander, open the network neighborhood (you can find it either in the drive bar or in the drive combk box)
2. In the network neighborhood you will find "secure ftp", open it
3. Now you can create a new connection by pressing F7
4. Enter host name, username and password
5. Click save
6. Double click the connection
Should be as easy as with other tools.
You must make sure that you have some DLLs placed within totalcommander folder. Please scroll up a few posts, i discussed it there
Good luck!