Adding mods is very straight forward:
- Download the mods you want from somewhere like https://mods.factorio.com/
- Go to the LOW.MS Control Panel at https://control.low.ms.
- Click "File Manager" and navigate to "/mods".
- Click Upload and then Choose File. Select the mod file you downloaded in step 2, this should be a .zip file.
- Upload the chosen file/files.
- Restart the server!
Please note, if the mod you're trying to download is too large, you may need to use an FTP client to install said mod. You can use this link as reference.Order your Factorio server now here