Describe it
Type what you want into the message box and send it. The more specific you are about who the server is for and what should happen there, the better the first draft. A good prompt looks like:
A gaming community for an RPG guild with announcements, an LFG area, build sharing, voice channels and a moderator-only section.
The quick-start chips above the box fill in examples like this for you. If your request is vague the AI asks a question or two first; just answer in the chat. When it has enough to work with, the proposed layout appears in the panel beside the conversation.
Or start from a template
Below the message box you'll find ready-made templates: a curated gallery, Your templates (designs you saved) and Community templates shared by other server owners. Clicking one gives you a ready-to-review plan instantly and for free, and you can still change anything in chat before building.
The chat reply is a summary; the design in the panel is the single source of truth. If the panel looks thinner than the chat described, or you see a note that the design got cut off, tell the AI to make it a bit smaller or split it into a couple of steps and it will rebuild a complete version.