There are 2 options, or a combination of both.
1.) Any member of this forum can submit a link to it, simply click the "Submit a Link" in the menu to your left and fill out the form. A staff member will be along to approve it.
2.) Members can't add content to the downloads section, only staff can. But, we can manually set up the download section so that it acts as a mirror for the pdfs. Just let us know what you want for the "file name", "description(include any copyrights)", "author(s)". and we'll place the pdfs on our site with a link to the original content too.
Let us know what you want us to do.