Short answer, the files you’ll need to edit are under \Stonehearth\mods. You’ll see a number of files ending with .smod such as stonehearth.smod. The smod file extension is just a renamed compressed archive like zip.
You’ll want to browse the archive or extract the files. You’ll want to familiarize yourself with searching this forum as there are a number of helpful posts with a few how-to questions answered. There’s a Modding category you can browse through for a number of helpful posts.
Some starting material:
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Beware the Nights of Candledark, Our First Holiday Mod! – Stonehearth
– Radiant’s first published mod. This blog post is a good starting point for starting to mod.
Assortment of older forum posts:
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stonehearth (Gareth Loremaker) · GitHub
– Github repository of some great resources.
Have fun 