I'm starting to get it now. I'm still trying to get posts, pages, categories, and templates straight. It looks like I first need to create a new category to hold the files I want to make available for downloading, then add new post (or page?), then there's a button for WP-file base to poke, and a new window with all the WP-File base options in it. This will insert a WP-Filebase tag into my post for me.
But since none of the four templates offered under "File list" will include the file mtime in the post, this is where I would add a template to do this at the "Add Template" option?
I thought WordPress was supposed to be an easy way to create a web page.
What's the difference between posts and pages?