If you want to create a Forum page using the Elementor plugin, you can visit this page https://www.buddyboss.com/resources/docs/components/forums/forum-shortcodes/
Site admins can use shortcodes to display various types of forum content within WordPress. To use the shortcodes below, make sure the Forums component is enabled, and then copy and paste the shortcode onto any WordPress page, making sure to include the opening [ and closing ] brackets with each shortcode.
To get the required post ID for $forum_id, $topic_id, $tag_id, and $reply_id as required by certain shortcodes, you will need to log into the WordPress admin, and go into BuddyBoss > Forums and then find the post content you are looking to reference. Hover over the post and then click the ‘Edit’ link. Once the edit page loads you can copy the ID from the URL of the post, eg. /wp-admin/post.php?post=47 where 47 is the ID.