In accordance with some embodiments, a computer-implemented method is performed at a portable electronic device with a touch screen display. The method can include: displaying graphics on the touch screen display, detecting a finger contact on the touch screen display, and, in response to the detected finger contact, inserting an insertion marker in the graphics at a first location. The method can further include detecting a finger movement on the touch screen display and, irrespective of initial distance from finger to insertion marker on the touch screen display, moving the insertion marker in accordance with the detected finger movement from the first location to a second location in the graphics.