Add full name to member pages problem

I’m trying to add Full Name above the nice name (@mentionname) in profile pages. In order to do that I’ve created buddypress/members/single folders in my child theme, copied the member-header.php into single folder and changed these lines:

this:

<?php if ( bp_is_active( ‘activity’ ) && bp_activity_do_mentions() ) : ?>
<h4 class=”user-nicename hover-tip click-tip” data-toggle=”tooltip” data-container=”body” data-title=”<?php bp_last_activity( bp_displayed_user_id() ); ?>” data-placement=”bottom”>@<?php bp_displayed_user_mentionname(); ?></h4>

to this:

<?php if ( bp_is_active( ‘activity’ ) && bp_activity_do_mentions() ) : ?>
<h4 class=”user-fullname hover-tip click-tip” data-toggle=”tooltip” data-container=”body” data-title=”<?php bp_last_activity( bp_displayed_user_id() ); ?>” data-placement=”bottom”><?php bp_displayed_user_fullname(); ?><small>@<?php bp_displayed_user_mentionname(); ?></small></h4>

as recommended. But It has no effect on my site. It still shows the KLEO member-header.php code in source. What am I doing wrong here? Cheers.