So where does this user profile/dashboard come from in the screenshots on the wpdiscuz wesbite?
The screenshot shows how the wpDiscuz – BuddyPress Integration addon works. To use the addon you need to first have the BuddyPress plugin.
The wpDiscuz – BuddyPress Integration addon is just an integration solution. It just combines and synchronizes the comment system powered by wpDiscuz with the user profile system built by BuddyPress plugin. It includes notifications, activity streams, profile tabs, settings and more…
Besides, if you want to have the same appearance as it's shown in the screenshot you should choose a theme developed especially for BuddyPress, like BuddyX. You can find it here: https://wordpress.org/themes/buddyx/