I think you're going the wrong way.
In your case, pull- and flush-left are divs defined in file \include\staff\ticket-edit.inc.php:

These divs are then formatted in CSS files:

Of course, you can modify the values in CSS. But keep in mind that you can influence more elements in the whole osTicket than just the one you are interested in.
It would be best to create a new div in CSS, which you will then link to from PHP.
However, from the first screenshot I feel like you need to adjust the position of the whole block. In the last screenshot you try to adjust only the position of the title.