Using Cpanel and Frontpage 2003

I created my site using CanSpace's online Cpanel RVsite builder.

I then downloaded the my site into Frontpage 2003, made changes then published it.

If I would now like to continue to edit the site in the CanSpace's online Cpanel RVsite builder to add additional features like a Forum how can I get the
lastest publish code into Cpanel. When I log onto CanSpace and view my site
it is not the published online version it is the last version I edited with Cpanel.

Thanks for you help, hopefully this is easy, i am new to this tool.