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
domain/youdidit.php?ticketsent=true
that way you can have some control and can in the "youdidit.php" do some code depending on the ticketsent statement and so on.
