In your game panel navigate to configuration files
Click on config\server-settings-xx.json (where xx is the version closest to what you are running on the server, for versions 15 and up use the version 15 file)
Within this file find
"visibility":
{
"public": true,
"lan": false
},
"_comment_credentials": "Your factorio.com login credentials. Required for games with visibility public",
"username": "",
"password": "",
Enter the username and password you use to log into factorio.com
save the config file
restart your server
It should now appear in the server list.
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