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this is the best tutorial I can find on simple html dom

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_10277-HTML-Manipulation-Made-Easy.html

However, all of this is just to wet your appetite. There are plenty of good and useful examples on the Simple HTML DOM web site. So if you're working with HTML manipulation of any sort (scraping, updating, etc...), make sure you try out this library. It can really simplify your life!

But many of the tutorials just call the find object

Where is a tutorial that is more advanced or are there more advanced examples of submitting forms.

So what is your question?  What are you trying to do?
This is for PHP capturing a webpage and "scraping" it before sending it on to the browser.
You have made reference to submitting a form... are you trying to automate a process?
The find function is used to find html elements in the page.  When you don't know the structure of the page your scraping, this would seem to be the most efficient and easiest way to get the content you are wanting to capture.

Please take a look http://php.net/manual/en/book.dom.php

Write more about you want, in html or in php coding or tutorial