Hi,
1. To move the continue shopping button, you need to edit the file "step" of the checkout view and remove the code:
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"');
and add it at the end of the "cart" file of the view "checkout".
You can do that via the menu Display>Views. Don't forget to add the <?php ?> tags around the code if you need them.
2. You would have to edit the file plugins/hikashoppayment/paypalexpress/paypalexpress.php and try to add the line:
$inserthtml .= $this->plugin_data->payment_description;
after the line:
$inserthtml .= '<td colspan="2">'.$this->button.'</td></tr></tfoot>';