Not admin of your server? Here's how to get started — a couple of clicks for the admin, you do the rest.
Discord lets only a server admin invite a bot, and Raid-Helper hands its key only to admins. Everything else — the setup, the pages, the plan — can be yours. Send your admin the message at the bottom; it takes them about a minute.
The admin — about a minute
Invite the bot — pick the server, Authorize. (It reads the raid channels and posts there; nothing else.)
In the server, type /delegate user:@yourname — that makes you the guild's admin on this site.
Type /apikey and send you the key Raid-Helper answers with.
You — about five minutes
Log in with Discord here; the server is listed as yours with Set up.
Fill in the guild's name and realm as Warcraft Logs spells them, a Warcraft Logs API client (free — warcraftlogs.com → API clients), the Raid-Helper key, and which Discord roles are officers and raiders.
Done: the site builds, the bot posts in your server, raiders log in with Discord. Plan and billing sit on your servers page too.