Install a NeoForge 20.6.125 (MC 1.20.6 ) server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → NeoForge 20.6.125 (MC 1.20.6 ))
I honestly love how I can access the actual files of the Minecraft server; it makes it so much easier to add mods that aren't available on most other server hosts.