in insight, drag and drop the point in point editor. mid way down on the left is where you set the slope and intercept. click on the ... button, select the sensor/signal type and define the range - click calculate, click ok, and it will populate the values in the correct areas, save point.
if using a terminal emulator (ie hyper terminal), point, edit, modify, enter the point name, adjust fields accordingly. Have to manually determine the slope and intercept though and manually enter the values.