Hi asutay
It's title of contact form, defined in:
/templates/ja_blockk/html/com_contact/contact/default.php
<h2><?php echo Text::_('TPL_CONTACT_TITLE_FORM_CONTACT'); ?></h2>
If you want to change the text, you can go to Backend >> Languages Overrides >> and override this language constant: TPL_CONTACT_TITLE_FORM_CONTACT
