Forgot to add my wife's name as dependent in Stage 2 form

I have just realized that I’ve forgotten to add my wife’s details as dependent, although I did add her name as my spouse.

Since I have paid the Stage 2 fee I can’t change the form. This means I must cancel, and then submit a new application. The website says “If your request for a refund is successful, your money will be refunded to the same account you used when you paid for your application”.

What account do they mean? Bank account? Credit Card? or the GTV account at the Home Office website?

Do they make a full refund? Is this even important?