Trying to display message After Record Add event

I have a very simple request form and I would like to display a stock message on the users screen after they successfully add the record to the database through the Add button.
I have added this snippet to the project.
echo $ret["message"];
I am unable to find the location of the message variable to customize the message and also, I would like to be able to change the formatting a little so would this method allow me to do that?