Tutorial - Installing mods for Starbound | Chucklefish Forums They can be found at Steam folder/steamapps/workshop/content/ You figure out which is which by finding the ID in the url of the mod. Click install under the item labeled 'Workshop Files'. Third, Alt+Tab out of the game, and go to your Downloads page in the Steam program.
You will notice ta file is in the first folder inside mods. Just create o file like I've shown, using notepad or something similar. If the mod doesn't file but has folder with the name.