whmcsDNSManager/modules/addons/DNSManager2/templates/clientarea/default/pages/dashboard/modal/edit-rdns.tpl

<div class="modal" tabindex="-1" role="dialog" aria-labelledby="" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <form class="form-horizontal" action="" method="post">
                <div class="modal-header"><button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                    <h4 class="modal-title">{$MGLANG->T('edit_rdns')}</h4>
                </div>
                <div class="modal-body">
                    <div class="form-group record-rdata"> 
                        <label class="control-label col-sm-3">{$MGLANG->T('rdata')}</label>
                        <div class="col-sm-7">
                            <input class="form-control" type="text" name="rdata" title="{$MGLANG->absoluteT('addonAA','zones','record_field_info','PTR', 'ptrdname')}" placeholder="{$MGLANG->absoluteT('addonCA','zones','record_field_placeholder','PTR', 'ptrdname')}" value="{$rdata}"/>    
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">{$MGLANG->T('cancel')}</button>
                    <button type="button" class="btn btn-success" data-query="rid={$rid}" data-act="editRDNSSave">{$MGLANG->T('save_changes')}</button>                                  
                </div>
            </form>
        </div>
    </div>
</div>