Okay, here goes:
First you are going to modify the packslip.php file in your admin folder. depending on where you want the text to show up, you will insert the following code:
<div id="packingSlipClosure"><?php echo PACKING_SLIP_CLOSURE; ?></div>
A good place would be outside of the table, but inside the body tag. Around line: 169
then, you would edit the language file where you 'define' PACKING_SLIP_CLOSURE.
edit: admin>includes>languages>english>packingslip.php
and add the line at the top (around line 22): ```
define('PACKING_SLIP_CLOSURE', 'Thanks for shopping with us today!');
or the closure you want it to say.
and lastly... you will want to edit: admin>includes>stylesheet.css and add the following: ```
#packingSlipClosure {}
```and insert whatever css code you would like to add...
** The most important thing to keep in mind when editing admin pages, is there aren't really overrides there. so you need to keep track of all the edits you make. when you upgrade to a new version of ZenCart those files will have to be re-edited.
There are few efficient ways to do this, that i'm sure you can find with a search in the forums.
Hope that helps...