DNN 5.6.1 Smith BuyNow 4.0.0

I'm requiring login to complete my orders. The login boxes are apperaring fine with the UserName defaulted to the email address of the purchaser. I'm having trouble with the password validation. I'm getting the "Password must be at least 7 characters...." for anything entered less that 8 characters. It also shows invalid for any attempt to use a non alphanumeric character.

I'd like to use the same validation requirements that DNN uses.

Thanks in advance for your help.