matrix-puppet-discord_ynh/doc/POST_INSTALL.md

After the install is complete, start a chat with @_discordpuppet_bot:yourserver.com. When it joins, type help in the chat to see instructions.

You also may modify the /etc/matrix-puppet-discord/user.config.yaml file to customize some configuration (like permissions to use the bridge). Ensure then to restart the bridge (systemctl restart matrix-puppet-discord).