Hi Aganierm. The 2-corner wang sets in this asset pack have been set up as terrains in the Tiled tileset file. Back when I created this tileset (2018! Yikes, time flies) I found it much easier to paint maps using Tiled's terrain feature over their wang set feature, and at the time it seemed to me like Tiled's wang set feature was mainly focused on flood filling maps with a variety of tiles, not what I was using them for.
It can be done, though. You might find some use in setting up the 2-edge sets, like the paths and rivers, since those don't fit into Tiled's terrain feature. Personally I still find it easier to hand place these tiles.
My documentation isn't specific to any program, so you won't find any help in there for setting it up. Here's a screenshot of how I just did it: https://imgur.com/a/UGoo7cH
Hope that helps.