Ok should be simple to sort out:
Firstly make sure you have the latest update installed, and also make sure you click on the circle next to singleplayer (not suggesting youre an idiot, i just want you to be definate that its on single mode) and start the game, if this doesnt work close the launcher and go to the starmade folder which should be on your desktop, open it up and double click the file \'Starmade-Dedicated-Server-Windows\' (if you have a mac click the \'-macosx.command file and for linux \'-linux.sh) this will run and command screen (black box with white writing) wait for the messages to stop and load and start up the game.
let me know if this helped!