As you move around a graph, FX Graph will constantly give you small messages describing what is under the mouse. The messages may be the equation of the function, a point of interest, details of an integral or the location of an asymptote. If you left-click while one of these messages is on screen, FX Graph will create an annotation at the same location with the same information. This feature means that most annotations in FX Graph are created automatically!
Some of the annotations created this way will have their anchors locked to a point.