sudo is not setup by default
if you want to use it YOU must set it up
use " su - " ( with the dash)
yum is the name of the program
yum ( all this will do is display a simple HELP list)
yum update ( will run the update)
-- see --
yum --help ( for a list of commands )
-- like --
yum install < package name> ( without the <> )
yum erase < package name> ( without the <> )
If you're logged in as root, you don't need su or sudo.
On fedora 10 YOU CAN NOT login as root using the gui , unless you hack fedora 10 and that can cause a bunch of odd behavior .
and have you installed the rpmfusion repo ,if not go through this guide/help page