By editing a manure prohibited area, you can change the geometry. To do this select Drawing Tools | Edit Features | Manure Prohibited Area. Click on the Manure Prohibited area you would like to edit.  A box will pop up confirming you are editing a manure prohibited area. Click on the boundaries and drag them to shift the geometry of the area. When the area is of the desired shape, click Save Manure prohibited Area. If any other manure prohibited areas need to be edited continue this process.