By default, we do not have a setting on the BuddyBoss Platform that will make the "Notify me of New Replies" enabled by default when posting New Discussion on Forums. However, you can use the JavaScript code below to achieve this. 

Please follow the steps below:

1. Go to BuddyBoss > Theme Options

2. Under JavaScript, enable JavaScript

3. Append the following:

jQuery(document).ready(function($) {

    $("#bbp_topic_subscription").prop('checked', true);

});

4. Save changes.

Note: Any modifications are considered custom work already. Know more about our Support policy here: https://www.buddyboss.com/support-policy/

Without the code:

With the code: