You should be redirected to Seed Info page. Click "Create New Room"
You should be redirected to a new room page. This will contain a link to download the seed zip for the KH1 players, all the information they need to connect, and all the files/info for other players
Connecting to the multiworld server
KH1 players should begin by download their seed zip. This is either provided by their host, or they may click the "Download Patch File..." link associated with their slot in their game.
Using that downloaded seed zip, generate your mod for OpenKH using the same instructions as the "Generating the mod" step in the Setup Guide