Hi Kelly,
Dining reservations can be made by calling 407-WDW-DINE or
online. The last few trips we've taken I did all of our dining reservations online, which I found easier than making a phone call. However, had I had any questions, I didn't have anyone to speak with about them.
Just an fyi, you can begin making your dining reservations 180 days out. If you are a Disney resort guest, you can make 10 days worth of reservations at that time. If you are interested in character dining, I'd encourage you to make those reservations as close to that window as possible. If you are unsure when to make that call, you can use the PS Calculator at www.pscalculator.net; it is located over to the top, left of the home page to help you determine the day you can begin making reservations.
Thank you for the question; please let us know if you have any more questions.