Putting out a newspaper, or at the very least a leaflet is not all that difficult. Historically anybody who could learn the tools and afford to buy them could do it independently. Although more commonly an individual would pay a printer to put out whatever it is he (and often it was a man) wanted to publish.
This trend continued, presses were big and complicated but eventually, like all technology they got smaller. Smaller presses accompanied by an easier process meant that putting out a flyer or a leaflet became easy. So easy in fact even a horse could do it.
Mister Ed has something to say, his back was sore and he wanted to prevent the riding of horses. For him the obvious solution is to break out a small (for the mid-20th century) pedal-operated printing press.