If someone posts a new blog, an automatic post about the blog will be posted in the site’s activity feed. You can enable this option by following the steps below:
1. Navigate to the BuddyBoss dashboard – Settings – Activity.
2. Under Posts in Activity Feeds, tick the checkbox of WordPress Posts. When members publish new blog posts, show them in the activity feed. You may refer to the screenshot:

3. Don’t forget to click on “Save Settings” below the page to save the changes.