If you search for the site setting ā discourse narrative bot welcome post typeā and select āSend all new users a welcome message with a quick start guideā, new users will receive a notification that uses the Welcome User email template. They will receive this as a notification when they first visit the forum. I donāt see an option to automatically send the notification as an email.
The easiest way to see if new users are getting the notification is to create a new account on your site and see if you get it. I can confirm that on my own site, if the discourse narrative bot welcome post type Site Setting is set to āSend all new users a welcome message with a quick start guideā, new users get the New User notification when they first login to the site.
To edit the content of this message, you can either edit the email template that I mentioned above, or go to Admin/Customize/Text Content and edit system_messages.welcome_user.text_body_template and system_messages.usage_tips.text_body_template. Editing the text content instead of the email template lets you edit the placeholders that are used in the email template.