1. Get the Certificate from the FTP Server you are using/Maintaining. (You can get this certificate from the person maintaining the FTPES server).
2. Create a Keystore Activity using this Certificate. Refer to Creating Keystore section in the Administrator Guide (pg. 50).
3. While creating a FTP Target Activity Select this Keystore Activity in the Keystore name Dropdown List.
4. Select and fill in the corresponding information