Hi,
If the "continue shopping" option is configured, the button will be automatically display in the "checkout | step" view.
You will find at the end of the view this content:
if($this->continueShopping){
if(strpos($this->continueShopping,'Itemid')===false){
if(strpos($this->continueShopping,'index.php?')!==false){
$this->continueShopping.=$url_itemid;
}
}
if(!preg_match('#^https?://#',$this->continueShopping)) $this->continueShopping = JURI::base().ltrim($this->continueShopping,'/');
echo $this->cart->displayButton(JText::_('CONTINUE_SHOPPING'),'continue_shopping',$this->params,JRoute::_($this->continueShopping),'window.location=\''.JRoute::_($this->continueShopping).'\';return false;','id="hikashop_checkout_shopping_button"');
}
It display the button, just near the "next" one.
After that, if you want to customize the button, you can use some CSS.
Regards,