So I'm trying to install a mod that physically needs to be put into the mod folder, one issue I cant find it I've tried to find it through C:/Users/{yourusername}/AppData/LocalLow/Jundroo/SimpleRockets2/Mods but nothing shows up when I do so. [If it matters I'm using a steam install of the game]
I don't think it matters whether you install through steam or not. That's just where Juno puts its files on Windows.
I'm a little rusty on Windows, but I think
C:/Users/{yourusername} should be visible no matter what, but Appdata might be a hidden folder. File explorer should have an option to show hidden files.
This might help:
https://www.howtogeek.com/885078/cant-find-appdata-folder-on-windows-11-how-to-get-it-back/