@trading-prana Once you have the variable created, it needs to be placed as a value in the Draw Line block. In this instance, you will need to set the block to draw a horizontal line and then the value below that relates to the price i.e. the height on the chart at which you want the line to be drawn. Change the setting in the first of the pull-down menus to "Value", the second to "Numeric" (it should default to that) and then where you see a current value of "1" right-click that box and a list of your constants and variables will be displayed. Pick the variable created to give (high+low)/3 and the line will be drawn at that level on the chart.
Of course, the value (high+low)/3 is in most occasions going to be significantly below the current price so you may need to zoom way out on the chart to see it.
