WordPress SEO plugin (by Yoast) and BuddyPress [closed]

This is possible using the filter wpseo_breadcrumb_links.

In this example, I’m using the functions bp_get_user_meta and bp_loggedin_user_id, adjust as needed.

To check if the page is child of the Members page (in this example, ID == 2), I’m using the function has_parent grabbed from here.

add_filter( 'wpseo_breadcrumb_links', 'buddy_crumbs_wpse_88889' );

function buddy_crumbs_wpse_88889( $links )
{
    // apply only in childs of Members page
    // in this example, Members has the ID of 2
    global $post;
    if( !has_parent_wpse_88889( $post, 2 ) )
        return $links;

    $user_info = bp_get_user_meta( bp_loggedin_user_id(), 'nickname', true );
    $links[] = array( 'url' => '', 'text' => $user_info );
    return $links;
}

function has_parent_wpse_88889($post, $post_id) 
{
    if ( $post->ID == $post_id ) 
        return true;
    else if ( $post->post_parent == 0 ) 
        return false;
    else 
        return has_parent_wpse_88889( get_post( $post->post_parent ), $post_id );
}