If you are being prompted to enter a Credit Code then your form is not online to your Ftax Account. You need to be online to enable your form to communicate with your Ftax Account to automatically manage the credits. An Ftax credit will enable a form to be calculated, printed, and submitted as many times as required for a given UTR and tax year.
To ensure the Ftax form is online, click the ‘?’ in a red ball, select the bottom option, and make sure the box to the bottom left is unticked. You will then be able to enter the Ftax Account username and password and login.