League owners use Settings → Discord Bot, and channel owners use the Discord tab in channel admin. Click Add Griddy to Discord, choose your server in Discord, then come back and click Connect next to the server Griddy just joined.
All of Griddy's settings live on the website, not in Discord. Once Griddy is in your server, you choose its results, announcements and broadcast links channels from a list. The list only shows channels Griddy has permission to post in.