Hi,
The text can be changed with a translation override, like any text of the interface:
www.hikashop.com/download/languages.html#modify
Then, if you want to change the position and the link, you can edit the file "show_default" via the menu Display>Views and change/move that code:
<div id="hikashop_product_contact_main" class="hikashop_product_contact_main"><?php
$contact = (int)$this->config->get('product_contact', 0);
if(hikashop_level(1) && ($contact == 2 || ($contact == 1 && !empty($this->element->product_contact)))) {
$css_button = $this->config->get('css_button', 'hikabtn');
?>
<a href="<?php echo hikashop_completeLink('product&task=contact&cid=' . (int)$this->element->product_id . $this->url_itemid); ?>" class="<?php echo $css_button; ?>"><?php
echo JText::_('CONTACT_US_FOR_INFO');
?></a>
<?php
}
?>
</div>