The swap option is only available for the Silver Annual and Gold Annual subscribers.

As a Silver Annual subscriber, you have the choice to select either a CPTS, CBBH, or CDSA voucher to redeem for an exam and not a CWEE.

As a Gold Annual, you have the CWEE and CAPE voucher in addition to the three mentioned before you can switch freely between them until redeeming one.

You are allowed to freely exchange vouchers until you make a final decision on which one to utilize.

To do this, you need to click the voucher icon under your avatar, choose your current exam voucher, and select the one to exchange for. You can then finalize using the Exchange Vouchers button and Proceed.