HoMM V: Map Scripts Editor

The script editor embedded in the map editor isn't working for me, so I downloaded the HoMM V Map Scripts Editor. But I don't understand what to write where. In other words, everything is clear in the map editor itself: you go into an object and edit the script. But how do I work with this program?
And Happy Victory Day to everyone!

As far as I know, the map archive in the map.xdb file should contain a reference to MapScript.xdb, which in turn should contain a reference to MapScript.lua. I don't know what you already have, but in the end, it should look like this, and all the code can be written in this MapScript.lua file.

In the settings, set the language to Russian. Open any map. The "MapScript.lua" file for that map will open automatically. You can write your script there. This program displays simple syntax errors in the script and allows you to create Lua and TXT files within the map archive.

I don't have MapScript.lua in the script editor. What should I do?