How do vouchers work?
If you have a voucher for Radiojar, you can use it to get a discount when paying for a new station. Before the actual payment screen you can see a breakdown of what you're about to pay when creating a new station. You can use the "redeem voucher" control at the bottom of the page to add the voucher you have. If successful, the cost breakdown above will be updated with the deduction you receive because of the voucher entered. You can then proceed to pay any remainder, if necessary.