Planning a mission to plot trees on land

You need to find the area you are interested in on the map, either by browsing there directly or by typing in the name in of the town in the search tool (bottom left slideout, magnifying glass icon). 

Then do long presses to drop 3 survey area boundary markers. Then you can use the smaller orange markers in the middle of each segment to expand the area out to whatever you need. You can move the large markers after they have been dropped.

Then double tap on the anticipated takeoff location to drop a purple dot which denotes the planned home location or just connect to the aircraft.