Hi Antonia,
You can absolutely upgrade your Quick-Service Dining Plan to the regular Disney Dining Plan and simply pay the difference between the
cost of the two Disney Dining Plans.
If you decide that this is something which you would like to do, you
will need to contact the company with whom you made your original
vacation package reservation with. They will be able to tell you what
the exact cost of upgrading your Dining Plan will be. If you booked directly with Disney you can reach them by calling (407) W-DISNEY.
It is well worth the extra money in my opinion as there are so many
fabulous Table-Service restaurants at Walt Disney World to experience.
If you do upgrade, I would strongly recommend that you make advance
dining reservations for your Table-Service meals straight away. As
advance dining reservations can be made up to 180 days in advance, I
suspect that some of the popular restaurants may be booked up already.
Dining reservations can be made online at the Walt Disney World website
HERE.
Wishing you a magical trip filled with memories which will last a lifetime!