Bidding and Voucher

[summer7416]

I'm bidding for an item and I want to use my voucher as a method of paying. How can I ensure that as it doesn't come up as an option when I check the payment options? 
thank you. 
Summer 

[tobiasd4]

If you win the item, on 1st page of ebay checkout at the bottom is option to add vouchers,

if Nectar voucher it will already show,

you may have to scroll down to see it.