Hi,
These are already on two lines by default in HikaShop. This means that the fact that they are on one line comes from your template and you should seek advice from your template provider on the proper method to change that.
From what I can see, you'll have to remove the code:
float: right;
from the line :
.hikashop_subcontainer .hikashop_product_price_full {color: #444;font-size: 16px;font-weight: 600;text-decoration: none;font-family: Open Sans;float: right;margin-bottom: 0;text-align: right;line-height: 1.2;padding-top:13px;}
in the file
xprime.payo-themes.com/templates/xprime/css/custom.css
of your template.
That way, you'll have the title and price on two lines.
However, they will be in the reverse orde rthat you want.
To change that, you would also have to edit the file "listing_img_title" of the view "product" via the menu Display>Views in order to change the order of the two blocks of code relative to the product name and the price.