Hi,
If you want a normal price and a discounted prices you have two ways to go about it:
1. you enter the discounted price in the prices area of your product and the normal price in the "retail price" field of your product. Both will display automatically on the product page.
2. You can also enter the normal price in the prices area of your product and create a new discount via the menu Orders>Discounts so that the discount reduces the product price. Both will display on the product page if you configure the "show discounted price" option of the configuration for that.