you need to make the forum on your hosting account at 000webhost
filezilla, is just a program to use to upload the files for you
you need to enter your 000webhost account info.... username, pass, then destination, etc...
i strongly suggest you contact 000webhost and ask them to point you to a "primer" on how to do this stuff.
these guys here are trying to help you, even beyond their need too.
but your not grasping what they are telling you
000webhost is the place that you need to start