Locate your save on your pc.
For Windows, it can be found in
%appdata% > Factorio > SavesSelect the zip of your world.
Log in to the Kinetic Panel.
Turn off the server.
Navgaite to File Manager.
Open the saves folder.
Upload the zip into the folder.
Open the settings page.
Locate the world file.
Change the 'save Name' name to the name of the uploaded zip file.
Start the server.
Factorio guide
How to upload your world to the Factorio server
This guide will quickly show you how to upload your Factorio single-player save to the server.