By default, the platform does not have this option. You can use the following JavaScript code to change the link of the "Sign in" button on the registration page:

Please follow the steps below:

    1. Go to BuddyBoss - Theme Options.

    2. Under Custom Codes, enable JavaScript.

    3. Append the following:

jQuery(document).ready(function($) {
    $(".bp_register .entry-header span a").attr("href", 
"https://baseurl/new-login/");
            });    

Note: You need to change the https://baseurl/new-login/ to your custom login page

    4. Click Save Changes.

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

Screenshots

Without Code:

With Code: