The Spear icon next to the rankings on the top bar. You create templates to use when farming (say, 10LC 1 scout) and when you click on a village on the map you get an option to send the templated party to that village.
It's also compatible with scouting reports and sends the optimal amount of troops needed to farm all resources the village would have by time your army arrives. Much like farmreport, the difference being the money you pay for Farming Assistant