We recommend using the new MAP EXPLORER in the Agent Dashboard for edit existing farm boundaries / areas. Please follow this tutorial: http://help.thegenie.ai/en/articles/7728193-agent-dashboard-map-explorer
OLD TOOL INSTRUCTIONS
You can go to Area Tools > Draw an Area BETA and click the Load Farm button at the right side of the map. This would allow you to load up an existing farm.
Once the farm loads up, you can double click on the dots in the boundary lines and move them as you prefer.
