I am printing address labels for all my contacts but the company name does not print on the labels. How to make the company name print?

if you haven't already, you would need to edit or create a new Print Layout (label) and add the Organization onto that layout...

Bit more easier said than done but that's the gist of it. Reply back if you need more detail.

The movie 'Define Label Sheet' (available on the training movies page, #9 under 'Administration) shows how to add contact information to a label.

In this case you'd want to use the path to the object's default role to get to its organization (Object > Default Role > Organization > Name)