Hi Sandra,
To edit the product page view, you can edit the view "product / show_default" in HikaShop > Display > Views.
Then you can cut & paste some code below other part of code.
In your case, I think that the easiest way is to remove the code:
<?php
//LAYOUT show_block_img
$this->row = & $this->element;
$this->setLayout('show_block_img');
echo $this->loadTemplate();
?>
And paste the code in the view "product / show_block_img" in "show_default" to put the div "hikashop_small_image_div" under the description of the product, put the div "hikashop_product_main_image_thumb" before the description and the div "hikashop_product_right_part" under "hikashop_product_bottom_part".
Hope this will help you.