In order to use the voucher codes we issue, you will need to be registered and logged in with a user account on our site before your voucher will work.
If you have a user account, then simply log in, navigate to the checkout page and enter your voucher code.
If you do not have an account, then first register and account, then proceed to the checkout and enter your voucher code.
Also note that voucher codes can only be used once, so if you have already used it previously then you will not be able to use it again.
Should your voucher code still not work after doing the steps above then contact us and we will help you further.