How to enumerate a list of posts?

I am not sure what your loop looks like from which you are adding the articles to your list. All you need do is to create a variable to hold your counter somewhere before the while statement in your loop. This could be something like

<?php $counter = 0; ?>

Note I am setting the counter to 0. Within the while statement you now enumerate this variable, this will keep on adding one to the counter for every time through the loop.

<?php $counter++ ;?>

Inside your loop you now use the variable to show the numbers you are interested in. This will give you a one on the first loop, two on the second etc.

Hope this helps.