1) Go to your WordPress dashboard, and click [Products][All Products].
2) Find the product that you want to amend, hover over its title and click [Edit].
3) Scroll down to the “Product Data” section, and click [Variations].
4) Click on the variation you wish to amend.
4) Amend your [Regular price (£)], and repeat step 3) for other remaining variations.
5) Scroll up and press the blue [update] button.