Found out myself!
just use a .php to post and a .php to get..
I do it like this =
I create 2 .php file, one "send.php" and one "get.php"
inside send.php you write:
<?php file_put_contents("data.txt", $_GET['data']);?>
inside get.php you write:
<?php file_get_contents("data.txt", $data)?>
And ADD an empty file named data.txt
So in total you just created 3 files that you will put in the same folder than your index.html file once exported.
In construct 2:
You add the action AJAX send to url:
~URL "./send.php?data=" & VAR
(you put your own variable instead of VAR, like textbox.text for exemple)
You add the action AJAX request from url:
Then you can add an event 'AJAX: on tag "quest-done" '
Who trigger the action 'set textbox.text to ajax.lastdata'
or even 'set variable to ajax.lastdata'
Like this you'll be able send and get what's in the file "data.txt" of your website!