I am in the process of loading a forum onto one of my sites

At the moment it contains a place holding index page.

I have downloaded all the phpBB forum files onto my own local computer into a phpBB folder and am not sure how to transfer them (as instructed to do) into my vodahost account using FTP.

Can someone explain (in simple terms)the correct proceedure to accomplish this.
There are a total of 11 folders and 16 files downloaded into the phpBB directory.