Before you can apply a number to your certs, you will need to purchase cert numbers from the NICEIC.
The first way to purchase your certs is online from the NICEIC webshop. This can be accessed from your NICIEC software, by going to Help > Purchase Certs.
Here, you can select the certs you require from the list, which is sorted alphabetically by short codes. This will then direct you to the NICEIC website where you can complete your purchase.
If you prefer, you can also contact the NICEIC directly to place an order.
You will then need to download the certificate order before you can use your numbers. See this support article for more information on downloading cert numbers. The NICEIC usually recommends allowing 30 minutes to an hour, for certificates to appear in the software.