Here is a list of the basic documentation topics for setting up WordPress/Discourse integration: https://meta.discourse.org/docs?ascending=false&category=53&search=wordpress%20how-to%20video. This topic is probably the best one to start with: Install and configure the WP Discourse Wordpress plugin for Discourse.
Can you explain in more detail what you are wanting to accomplish? I’m not sure if what you are wanting to do is provided by the plugin out of the box. Possibly this plugin does some of what you are looking for: Wp-discourse-shortcodes plugin. It provides a discourse_latest shortcode that displays the latest Discourse topics on a WordPress site.