http://en.wikipedia.org/wiki/Uploading_and_downloading

Now you have to be premium in 1 of the file host to do this OR you can use public leech websites.

To do RU from file host where are you premium, use their link-s and add your usernme and password like this:
Code: 
http://username:password@example.com
Then copy in remote upload window. If you using public leech websites (hard to find working one). Copy and paste megaupload, rapidshere or other link and click download. When it hits 100%, put mouse on link, click right button and "copy link location" and paste on remote upload window of the filehost.