What can I do to the price change

What can I do to the price change when I change the size of the product.

Sample
www.demo.hikashop.com/index.php?option=c...y_pathway=14&lang=en

I want to change the price when I press the switch size.
Help me please

Hi,

Once you add your characteristics to a product, you can click on the "manage variants" button to access all the variants of the product and set the price you need for each one of the variants.