After general parameters have been set up, the script can be launched. To do so, it is enough just to attach it to the chart. At that, of there is a "#property show_inputs" instruction in the program source code, the script setup window will appear automatically.
In the "Common" tab of this window, one can:
External variables of the script can be changed in the "Inputs" tab. They are variables of extern class. To change a parameter, one has to double-click with the left mouse button on its value and write the new one. At that, one can change the value of each variable or download the set of inputs already saved before (the "Load" button). One can save the current set of inputs with the button of the same name.
The "Reset" button returns all default settings. Parameters defined in the terminal settings are set in the "Common" tab. And parameters set in the source code of the program are defined as inputs. The script with the defined parameters can be confirmed by pressing of "OK" and canceled by pressing of button of the same name.
Script will be launched immediately after that. Double click with the left mouse button on the selected script in the "Navigator Scripts" window or execution of the "Execute on Chart" command of the script context menu will attach the script to the active chart. The "Drag'n'Drop" technique will allow to attach the script to any chart. If the "Remove Script" command appears in the chart context menu, it means that script is working. This command is active only while this MQL4 program is working.
Attention: Only one script can be attached to a chart.