Using Vouchers
Simply explore Givealittle and find something to support. Click on the donate button and select Voucher as the payment method - you will then be prompted to enter the code.
You don't have to use the full voucher in one go, the remaining balance on your voucher will be displayed each time you use the code.
You can also create a Givealittle Account and top it up with your voucher code, that way you don't have to remember the voucher code and can donate from your Givealittle Account instead.