It sounds like you have a PHP script that outputs the results of your post operation. You are right - the results of that operation will only be available to you after you have filled out the form.
In order to have a permanent page, you need to do one of two things:
1) create a page (using fputs and other functions). This is difficult to manipulate and change once it is made (with the exception of simply addending to the page).
2) store the results of your operation in a database and pull those results when someone wants to see them. Probably the preferred method.