Log onto the disney world website. Under the heading "Where to Eat" click on "Make Dining Reservations". Then locate the restaurant(s) you want to make reservations at. The will be a link out to the right for "Book Online". Click on that and then put in your date/time and click "Check Availability". The site will then come back and let you know if what you want is available or give you another option(s). Once you have what you want, put it in your cart. When you have finished all your selections, you need to click on "Cart Checkout". If you do not check out, none of your selections will be valid.