Download File for Marketpress is not Showing

Hiya

I have never had a file available for download.

I would like to list it for free using marketpress.

In the marketpress installation doco it has a Product File section in the create product page in the backend.

I can't find this anywhere? I have double checked my settings and I am NOT set up for 'product listings only'.

So, how to I upload the file? Where do I specify the url? And how do I list it within marketpress as a product?

Forgive me for the basic questions but i've never set up digital downloads before.

Cheers,

Johnny