I literally JUST did this like 5 minutes ago!
OK, log in to your account.
Where it says Disney Rewards__________ Show Rewards- click on "show rewards"
then clicke on "see rewards details"
then click on "redeem your awards"
on the right side under the list "i'd like to"
click on "order rewards"
First you'll need to order hte disney rewards card and add it to your cart- but it's free.
then you shoudl be able to add however much of your dollars onto it and then click order and it'll get mailed to you.