How do you change the prices of your website's products in PayPal?

I have only 2 products on my website for sale. Where can I change the prices of these two products? FYI, I do not have any shopping cart software on my site between PayPal and my website, my website goes straight to PayPal when you click Buy! under the product on my webpage. I scoured my PayPal account on the PayPal website, but I cannot find anything there in regards to changing the prices of my products. So I guess it is a setting that my Web Developer put in place, but where is that setting located, so that I can change it? Thanks!!!