How do I change product detail page

-- HikaShop version -- : 2.3.3
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.4.33
-- Browser(s) name and version -- : Chrome 34.0.1847.131

On the product detail page, I want to put the product description right side under Add to Chart button.

Can I put the pop up window for size chart each product or category on the product detail page.

Product detail page, I want to be like the images in the attachment. Is this possible?

Hi,

You can do that with some CSS. If you add that CSS below in the frontend CSS file of HikaShop via the Display tab of the HikaShop configuration, you'll get the description area under the right side of your product page:
.hikashop_product_bottom_part{
width: 44% !important;
float: right !important;
}

More information on how to add that CSS can be found here:
www.hikashop.com/support/support/documen...ize-the-display.html

I have no experience about CSS. Can you help me about this

You don't need an experience with CSS for that. If you can read English, you should be fine.
You just need to copy/paste the code I gave you in the HikaShop frontend CSS file, and the documentation link I gave you explains you how to edit that CSS file. So you already have all the pieces to do that.