Komento problem with template from yootheme.com

on this page : http://how-to.mailrouge.com/index.php/elabore/le-contenu

I cannot key-in and fill the fields of the komento area for this page,
could you try to post any comments there,
and if you succeed tell me which browser you are using.

I test and it does not succeed with Chrome, Safari, IE, and Edge ..

Thanks