You have two possibilities:
-
Set up DiscourseConnect so users will sign up and log in to your website, and when they try to log in to your forum it will be automatically. This is the usual setup. If you configure things like this then all registration and log in will be at your website. The username/password log in and registration on your forum will be disabled.
-
Set up DiscourseConnect so users will sign up and log in to your forum, and when they try to log in to your website(s) it will be automatically. This is called setting up Discourse as the DiscourseConnect Provider and how to do that can be found here.