Mensa? Nope, but it sure helps if you take the trouble to read at least an introduction to Fedora. Yum is so basic that it is certain to be covered. Anyway, to save you the reading:
- open up a terminal (It's an item on the Applications menu)
- become root (only root has permission to install software) by typing this into the terminal:
(supply root password when requested)
- then you perform the install by typing:
yum install bittorrent
But if you don't like the command line, you can just go to Applications >Add/remove software; the terminal will give you more information when something goes wrong so there are times when the command line really is the better choice.