Install a Just Another Twilight Forest Modpack (JATFM) server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → Just Another Twilight Forest Modpack (JATFM))
This is one of the best hosting sites I think I've ever used, everything is so simple and very easy to follow. The promotion of videos to also help users really makes it all the more better. My only issue is having to upload .jar files one at a time, unless you use drop box. Overall this is an incredibly amazing server hosting service.