Help How to select cells in HDGE (HD geoeditor)

[YeahThePro]

So I have managed to select an entire square by clicking selection -> select cell under cursor, but that selects the whole block. I'm trying to only select a little square (piece) to edit the geodata piece by piece (picture below). I've never touched any of these programs, so if anyone can give me any tips, I'd appreciate it. 

 

Edit: I also want to know how to "draw". I can see the options of those different triangle types (green/red combinations), but I don't know how to actually draw on the map.

 

https://imgur.com/a/nCzDmbP

Edited May 21, 2022 by YeahThePro