How do you plow someone elses field on farm town onfacebook?

To plow someone else's field in Farm Town on Facebook, you need to visit their farm and look for unplowed land. If they have set their fields to allow friends to plow, you can click on the plowed area to start working on it. Keep in mind that you can only plow fields if the owner has granted permission for friends to do so. If not, you will need to ask them to adjust their settings or help you with their field.