What Kelly said, however right click copy and paste doesn't work with Firefox, or at least many versions of FF (including mine). The keyboard shortcuts "Ctrl-C" and "Ctrl-V" do the same thing.
That's for regular email, if you are using the FSM Forum email they won't be "hot" links until you put them through the "insert/edit link" function (chain icon above). Paste the forum URL and click on Insert.