First, put the script somewhere in your home directory, e.g. ~/bin/cron-feeds.
Then, edit it using your favourite text editor.

You will probably need to change the following variables:
base   = home + "/lib/feeds/" # directory, where the state is being stored
renderc= "/usr/local/bin/elinks -dump /dev/stdin" # in case elinks is located elsewhere
mbox   = mailbox.Maildir(home + "/.Maildir/.feeds") # to point to the right Maildir.

Next, create the base directory:
mkdir -p ~/lib/feeds/

Then, put some feeds into the feeds-file:
$EDITOR ~/lib/feeds/feeds

Empty lines and lines starting with # are ignored. Other lines should be URLs to
Newsfeeds in either RSS or Atom format.

Finally, run it in cron: Run crontab -e and put something like this at the
bottom:
*/20 * * * * ~/bin/cron-feed