Classipress installation on WordPress issues

Hi,
I am like others it seems, completely new to WordPress! I purchased Classipress and Mydentity yesterday and don’t seem to be able to work out how to combine the two onto WordPress.org!.
It was suggested that I ‘FTP’ the folder.. I have downloaded Filezilla… but it is way out of my understanding!
Any advice, basic form (I won’t be offended!) would be really appreciated as I am completely stuck!