Install a Tensura That Time I Got Reincarnated As A Slime Evolved server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → Tensura That Time I Got Reincarnated As A Slime Evolved)
Server is really good and once you get the hang of it adding mods, schematics etc is really easy and the video guides help alot. The support team is also great, helped me with every question I've had and quickly too