Draw a line (A-B) connecting a major top and bottom. This will create the retracement lines for the range A-B. The retracements are defined in the Retracement Parameters window. You can change the color and thickness of the lines. Select to extend the retracements to the end of the chart and select to show the retracement values. You can change or add values. Values above 1 will work as an expansion of the range A-B.