I am using emacs 24 on fedora 17. I installed markdown-mode, but whenever I try to export a file by typing C-c C-c m or C-c C-c p in emacs
You just need to pick and install a markdown parser:
gem install rdiscount).yum install python-markdown2)Then, in emacs:
M-x customize-mode RET markdown-mode
Set 'Markdown Command' to the name of the executable you installed -- for example, rdiscount or /usr/bin/markdown2.