[Plugin: TDO Mini Forms] Let the user edit only his post

I am trying to create a site where you can register, post only one post and edit this as many times as he want.

with the help of these two post:
https://www.ads-software.com/support/topic/plugin-tdo-mini-forms-edit-own-posts-only?replies=4

https://www.ads-software.com/support/topic/tdo-mini-form-how-to-edit-post?replies=2
I’m trying to create the site

To do this I have installed on wordpress 3.0.1
-TDO Mini-Forms 0.13.9
-User-Role Editor 2.1.10
-Theme-My Login 6.0.1

In wordpress General Settings I’ve checked
-Membership: Anyone can register
-New User Default Role: Author

in User Role Editor I’ve edited the capabilities to author ticking only
-Edit_published_posts
-Publish_posts

TDO then I created 2 form,
The first is to let each user publish a single post
https://www.comunicazionecivile.it/demo/wordpress_tdo_form1.gif

The other is to let the original submitter edit his post
https://www.comunicazionecivile.it/demo/wordpress_tdo_form2.gif

Then, in single post template, I’ve add a button
if the current post is submitted by user logged in, show the link “edit my post”

<?php if ( $current_user->ID == $post->post_author ) {
?>
<a href="index.php?page_id=ID_OF_PAGE_WITH_FORM&tdomf_post_id=<?php echo $post->ID; ?>">edit my post</a>
<?php }	?>

when logged in user visit this link he go to a page like this:

https://www.mydomain.com/?page_id=1747&tdomf_post_id=1838

This works fine,
but if in the address bar the user changes the ID of his post with another, he can edit posts of other users!

https://www.mydomain.com/?page_id=1747&tdomf_post_id=1310

any solution?
thanks for your attention