How to modify location names on the map?

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Are there any guides or solutions about how to modify toponyms on the map? Yes, there is edsub.pdf but it outdated or unformative. I tried to correct some names and add new but its so confused.

The edsub document does cover how it works but if there is something that is unclear let me know.

Basically, you open the map and then select Mode -> Label Add/Delete and Display -> Map Labels.

Then to alter an existing name you must first delete it by right-clicking on it. Then left-click on the hex where you want to place it and the dialog come up already populated with the details of the description you have just deleted. Change it as you wish and click OK. If it is not quite correct, repeat the process. The save your changes.

That is all there is to it.