If you have received personal voucher, you will also be able to view it in the "My Vouchers" section:

How to use EveWiz voucher

Copy the code of the voucher you wish to use and once you have picked the items you want to buy then use it. In order to do this just go to your shopping cart (you should have your items in it).

When you are in your shopping cart you can then add the voucher code.

Once it is accepted your cart will look like this:

Then simply proceed to check out.

In your order history the transaction will be shown like this:

Fly safe.