The villagers are also a part of your clan. They gather food and build new objects. Unfortunately, most of the buildings require workers. To send a villager to work, choose him on the map, point to a chosen building, and press the right mouse button.
You can send the employees to different buildings - the settler will automatically switch his current place of employment. However, if you want to revert an employee back to his original form, simply send him to a house or a town hall.