i dont have that module myself.
but logicaly it should have a php file with the html code or a template file with the html code.
either way in that file you will find the statement
"A support ticket has been created and a representative will be getting back to you shortly. <blablabla>".
As you so nicely put it
find where this text is located and you can replace it with a forward to any page you wish (or edit the result yourself).
a good choice of command would be to forward the completed page to
that way you can have some control and can in the "youdidit.php" do some code depending on the ticketsent statement and so on.